设置导航栏以使用媒体查询滚动。 css html
Setting nav bar to scroll with a media query. css html
大家好，当我的页面全屏时，主要内容滚动并且导航固定。
我想做的是将导航设置为更小的高度（例如 250 像素）并让导航链接滚动占用更少 space。
设置为滚动时我看不到所有导航。
代码如下！我使用了未显示的 CSS 样式重置。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="styles.css">
<title>Javascript page</title>
</head>
<body>
<div id="wrapper">
<header>
<nav>
<h1>JS DOCUMENTATION</h1>
<ul class="navlinks">
<li class="navlink"><a class="link" href="#intro">Introduction</a></li>
<li class="navlink"><a href="#what2">What you should already know</a></li>
<li class="navlink"><a href="#java3">Javascript and Java</a></li>
<li class="navlink"><a href="#hello4">Hello world</a></li>
<li class="navlink"><a href="#var5">Variables</a></li>
<li class="navlink"><a href="#decl6">Declaring Variables</a></li>
<li class="navlink"><a href="#var6">Variable Scope</a></li>
<li class="navlink"><a href="#glob7">Global variables</a></li>
<li class="navlink"><a href="#const8">Constants</a></li>
<li class="navlink"><a href="data9">Data types</a></li>
</ul>
</nav>
</header>
<main>
<section class="intro" id="intro1">
<h2 class="section-title">Introduction</h2>
<p class="content">
JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a
host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide
programmatic control over them.
</p>
<p class="content">
JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements
such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by
supplementing it with additional objects; for example:
</p>
<ul class="content-bullet">
<li class="bullet">Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model
(DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user
events such as mouse clicks, form input, and page navigation.</li>
<li class="bullet">Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information
from one invocation to another of the application, or perform file manipulations on a server.</li>
</ul>
</section>
<section class="What-you-know" id="what2">
<h2 class="section-title">What you should already know</h2>
<p class="content">
This guide assumes you have the following basic background:
</p>
<ul class="content-bullet">
<li class="bullet">A general understanding of the Internet and the World Wide Web (WWW).</li>
<li class="bullet">Good working knowledge of HyperText Markup Language (HTML).</li>
<li class="bullet">Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
</ul>
</section>
<section class="java" id="java3">
<h2 class="section-title">Javascript and Java</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Hello-world" id="hello4">
<h2 class="section-title">Hello World</h2>
<p class="content">
To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code:
</p>
<code>
function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");
</code>
<p class="content">
Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!
</p>
</section>
<section class="Variables" id="var5">
<h2 class="section-title">Variables</h2>
<p class="content">
You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform
to certain rules.
A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be
digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the
characters "a" through "z" (lowercase).
You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences
as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.
</p>
</section>
<section class="Declaring-variables" id="decl6">
<h2 class="section-title">Declaring variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Variable-scope" id="var6">
<h2 class="section-title">Variable-scope</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Global-variables" id="glob7">
<h2 class="section-title">Global Variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Constants" id="const8">
<h2 class="section-title">Constants</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Data-types" id="data9">
<h2 class="section-title">Data types</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
</main>
</div>
</body>
</html>
<styles>
html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
display: block;
}
body {
line-height: 1;
}
/* ol,
ul {
list-style: none;
} */
blockquote,
q {
quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
content: "";
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Lato:wght@400;700;900&family=Montserrat:wght@100&display=swap");
* {
box-sizing: border-box;
}
body {
height: 100vh;
overflow: hidden;
font-family: "Lato", sans-serif;
}
#wrapper {
display: flex;
height: 100%;
}
header {
border-right: solid grey 2px;
}
h1 {
font-size: 1.5rem;
padding: 20px 20px;
color: black;
}
nav {
display: flex;
flex-direction: column;
justify-content: center;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
padding: 10px 10px;
}
a {
text-decoration: none;
color: rgb(77, 75, 75);
}
main {
overflow: auto;
width: 700px;
flex-grow: 1;
padding: 30px 50px;
color: rgb(77, 75, 75);
}
.section-title {
font-size: 1.5rem;
padding: 20px 0px;
color: black;
}
.content {
padding: 10px 10px;
word-spacing: 0.2em;
}
.content-bullet {
padding: 15px 40px;
}
.bullet {
padding: 10px 0px;
}
@media (max-width: 768px) {
#wrapper {
display: flex;
flex-direction: column;
height: 100%;
}
header {
border-right: solid white 2px;
}
body {
overflow: hidden;
}
main {
width: 100%;
flex-grow: 1;
padding: 20px 10px;
color: rgb(77, 75, 75);
}
nav {
height: 200px;
overflow: scroll;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
border-bottom: solid black 1px;
padding: 10px 10px;
}
}
</styles>
给你...
将此添加到您的 CSS：
.navlinks {
overflow-y: scroll;
height: 250px;
}
请参阅下面的代码段。
html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
display: block;
}
body {
line-height: 1;
}
/* ol,
ul {
list-style: none;
} */
blockquote,
q {
quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
content: "";
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Lato:wght@400;700;900&family=Montserrat:wght@100&display=swap");
* {
box-sizing: border-box;
}
body {
height: 100vh;
overflow: hidden;
font-family: "Lato", sans-serif;
}
#wrapper {
display: flex;
height: 100%;
}
header {
border-right: solid grey 2px;
}
h1 {
font-size: 1.5rem;
padding: 20px 20px;
color: black;
}
nav {
display: flex;
flex-direction: column;
justify-content: center;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
padding: 10px 10px;
}
a {
text-decoration: none;
color: rgb(77, 75, 75);
}
main {
overflow: auto;
width: 700px;
flex-grow: 1;
padding: 30px 50px;
color: rgb(77, 75, 75);
}
.section-title {
font-size: 1.5rem;
padding: 20px 0px;
color: black;
}
.content {
padding: 10px 10px;
word-spacing: 0.2em;
}
.content-bullet {
padding: 15px 40px;
}
.bullet {
padding: 10px 0px;
}
@media (max-width: 768px) {
#wrapper {
display: flex;
flex-direction: column;
height: 100%;
}
header {
border-right: solid white 2px;
}
body {
overflow: hidden;
}
main {
width: 100%;
flex-grow: 1;
padding: 20px 10px;
color: rgb(77, 75, 75);
}
nav {
height: 200px;
overflow: scroll;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
border-bottom: solid black 1px;
padding: 10px 10px;
}
}
.navlinks {
overflow-y: scroll;
height: 250px;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="styles.css">
<title>Javascript page</title>
</head>
<body>
<div id="wrapper">
<header>
<nav>
<h1>JS DOCUMENTATION</h1>
<ul class="navlinks">
<li class="navlink"><a class="link" href="#intro">Introduction</a></li>
<li class="navlink"><a href="#what2">What you should already know</a></li>
<li class="navlink"><a href="#java3">Javascript and Java</a></li>
<li class="navlink"><a href="#hello4">Hello world</a></li>
<li class="navlink"><a href="#var5">Variables</a></li>
<li class="navlink"><a href="#decl6">Declaring Variables</a></li>
<li class="navlink"><a href="#var6">Variable Scope</a></li>
<li class="navlink"><a href="#glob7">Global variables</a></li>
<li class="navlink"><a href="#const8">Constants</a></li>
<li class="navlink"><a href="data9">Data types</a></li>
</ul>
</nav>
</header>
<main>
<section class="intro" id="intro1">
<h2 class="section-title">Introduction</h2>
<p class="content">
JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control
over them.
</p>
<p class="content">
JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it
with additional objects; for example:
</p>
<ul class="content-bullet">
<li class="bullet">Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events
such as mouse clicks, form input, and page navigation.</li>
<li class="bullet">Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from
one invocation to another of the application, or perform file manipulations on a server.</li>
</ul>
</section>
<section class="What-you-know" id="what2">
<h2 class="section-title">What you should already know</h2>
<p class="content">
This guide assumes you have the following basic background:
</p>
<ul class="content-bullet">
<li class="bullet">A general understanding of the Internet and the World Wide Web (WWW).</li>
<li class="bullet">Good working knowledge of HyperText Markup Language (HTML).</li>
<li class="bullet">Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
</ul>
</section>
<section class="java" id="java3">
<h2 class="section-title">Javascript and Java</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Hello-world" id="hello4">
<h2 class="section-title">Hello World</h2>
<p class="content">
To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code:
</p>
<code>
function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");
</code>
<p class="content">
Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!
</p>
</section>
<section class="Variables" id="var5">
<h2 class="section-title">Variables</h2>
<p class="content">
You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules. A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also
be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase). You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can
also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.
</p>
</section>
<section class="Declaring-variables" id="decl6">
<h2 class="section-title">Declaring variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Variable-scope" id="var6">
<h2 class="section-title">Variable-scope</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Global-variables" id="glob7">
<h2 class="section-title">Global Variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Constants" id="const8">
<h2 class="section-title">Constants</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Data-types" id="data9">
<h2 class="section-title">Data types</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
</main>
</div>
</body>
</html>
尝试准确指出与您的问题相关的代码部分。
这样就容易多了！
虽然我找不到导航顶部对齐 200 像素的原因。你可以这样修复它。
.navlink:last-child {
margin-bottom: 30px;
}
.navlink:first-child {
margin-top: 200px;
}
大家好，当我的页面全屏时，主要内容滚动并且导航固定。
我想做的是将导航设置为更小的高度（例如 250 像素）并让导航链接滚动占用更少 space。
设置为滚动时我看不到所有导航。
代码如下！我使用了未显示的 CSS 样式重置。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="styles.css">
<title>Javascript page</title>
</head>
<body>
<div id="wrapper">
<header>
<nav>
<h1>JS DOCUMENTATION</h1>
<ul class="navlinks">
<li class="navlink"><a class="link" href="#intro">Introduction</a></li>
<li class="navlink"><a href="#what2">What you should already know</a></li>
<li class="navlink"><a href="#java3">Javascript and Java</a></li>
<li class="navlink"><a href="#hello4">Hello world</a></li>
<li class="navlink"><a href="#var5">Variables</a></li>
<li class="navlink"><a href="#decl6">Declaring Variables</a></li>
<li class="navlink"><a href="#var6">Variable Scope</a></li>
<li class="navlink"><a href="#glob7">Global variables</a></li>
<li class="navlink"><a href="#const8">Constants</a></li>
<li class="navlink"><a href="data9">Data types</a></li>
</ul>
</nav>
</header>
<main>
<section class="intro" id="intro1">
<h2 class="section-title">Introduction</h2>
<p class="content">
JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a
host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide
programmatic control over them.
</p>
<p class="content">
JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements
such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by
supplementing it with additional objects; for example:
</p>
<ul class="content-bullet">
<li class="bullet">Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model
(DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user
events such as mouse clicks, form input, and page navigation.</li>
<li class="bullet">Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information
from one invocation to another of the application, or perform file manipulations on a server.</li>
</ul>
</section>
<section class="What-you-know" id="what2">
<h2 class="section-title">What you should already know</h2>
<p class="content">
This guide assumes you have the following basic background:
</p>
<ul class="content-bullet">
<li class="bullet">A general understanding of the Internet and the World Wide Web (WWW).</li>
<li class="bullet">Good working knowledge of HyperText Markup Language (HTML).</li>
<li class="bullet">Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
</ul>
</section>
<section class="java" id="java3">
<h2 class="section-title">Javascript and Java</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Hello-world" id="hello4">
<h2 class="section-title">Hello World</h2>
<p class="content">
To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code:
</p>
<code>
function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");
</code>
<p class="content">
Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!
</p>
</section>
<section class="Variables" id="var5">
<h2 class="section-title">Variables</h2>
<p class="content">
You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform
to certain rules.
A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be
digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the
characters "a" through "z" (lowercase).
You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the Unicode escape sequences
as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.
</p>
</section>
<section class="Declaring-variables" id="decl6">
<h2 class="section-title">Declaring variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Variable-scope" id="var6">
<h2 class="section-title">Variable-scope</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Global-variables" id="glob7">
<h2 class="section-title">Global Variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Constants" id="const8">
<h2 class="section-title">Constants</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Data-types" id="data9">
<h2 class="section-title">Data types</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language
resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java
expression
syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript
to
JavaScript.</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system
based
on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based
object model instead of the more common class-based object model. The prototype-based model provides dynamic
inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without
any
special declarative requirements. Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
</main>
</div>
</body>
</html>
<styles>
html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
display: block;
}
body {
line-height: 1;
}
/* ol,
ul {
list-style: none;
} */
blockquote,
q {
quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
content: "";
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Lato:wght@400;700;900&family=Montserrat:wght@100&display=swap");
* {
box-sizing: border-box;
}
body {
height: 100vh;
overflow: hidden;
font-family: "Lato", sans-serif;
}
#wrapper {
display: flex;
height: 100%;
}
header {
border-right: solid grey 2px;
}
h1 {
font-size: 1.5rem;
padding: 20px 20px;
color: black;
}
nav {
display: flex;
flex-direction: column;
justify-content: center;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
padding: 10px 10px;
}
a {
text-decoration: none;
color: rgb(77, 75, 75);
}
main {
overflow: auto;
width: 700px;
flex-grow: 1;
padding: 30px 50px;
color: rgb(77, 75, 75);
}
.section-title {
font-size: 1.5rem;
padding: 20px 0px;
color: black;
}
.content {
padding: 10px 10px;
word-spacing: 0.2em;
}
.content-bullet {
padding: 15px 40px;
}
.bullet {
padding: 10px 0px;
}
@media (max-width: 768px) {
#wrapper {
display: flex;
flex-direction: column;
height: 100%;
}
header {
border-right: solid white 2px;
}
body {
overflow: hidden;
}
main {
width: 100%;
flex-grow: 1;
padding: 20px 10px;
color: rgb(77, 75, 75);
}
nav {
height: 200px;
overflow: scroll;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
border-bottom: solid black 1px;
padding: 10px 10px;
}
}
</styles>
给你...
将此添加到您的 CSS：
.navlinks {
overflow-y: scroll;
height: 250px;
}
请参阅下面的代码段。
html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
display: block;
}
body {
line-height: 1;
}
/* ol,
ul {
list-style: none;
} */
blockquote,
q {
quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
content: "";
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Lato:wght@400;700;900&family=Montserrat:wght@100&display=swap");
* {
box-sizing: border-box;
}
body {
height: 100vh;
overflow: hidden;
font-family: "Lato", sans-serif;
}
#wrapper {
display: flex;
height: 100%;
}
header {
border-right: solid grey 2px;
}
h1 {
font-size: 1.5rem;
padding: 20px 20px;
color: black;
}
nav {
display: flex;
flex-direction: column;
justify-content: center;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
padding: 10px 10px;
}
a {
text-decoration: none;
color: rgb(77, 75, 75);
}
main {
overflow: auto;
width: 700px;
flex-grow: 1;
padding: 30px 50px;
color: rgb(77, 75, 75);
}
.section-title {
font-size: 1.5rem;
padding: 20px 0px;
color: black;
}
.content {
padding: 10px 10px;
word-spacing: 0.2em;
}
.content-bullet {
padding: 15px 40px;
}
.bullet {
padding: 10px 0px;
}
@media (max-width: 768px) {
#wrapper {
display: flex;
flex-direction: column;
height: 100%;
}
header {
border-right: solid white 2px;
}
body {
overflow: hidden;
}
main {
width: 100%;
flex-grow: 1;
padding: 20px 10px;
color: rgb(77, 75, 75);
}
nav {
height: 200px;
overflow: scroll;
}
.navlink {
list-style-type: none;
border-top: solid black 1px;
border-bottom: solid black 1px;
padding: 10px 10px;
}
}
.navlinks {
overflow-y: scroll;
height: 250px;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="styles.css">
<title>Javascript page</title>
</head>
<body>
<div id="wrapper">
<header>
<nav>
<h1>JS DOCUMENTATION</h1>
<ul class="navlinks">
<li class="navlink"><a class="link" href="#intro">Introduction</a></li>
<li class="navlink"><a href="#what2">What you should already know</a></li>
<li class="navlink"><a href="#java3">Javascript and Java</a></li>
<li class="navlink"><a href="#hello4">Hello world</a></li>
<li class="navlink"><a href="#var5">Variables</a></li>
<li class="navlink"><a href="#decl6">Declaring Variables</a></li>
<li class="navlink"><a href="#var6">Variable Scope</a></li>
<li class="navlink"><a href="#glob7">Global variables</a></li>
<li class="navlink"><a href="#const8">Constants</a></li>
<li class="navlink"><a href="data9">Data types</a></li>
</ul>
</nav>
</header>
<main>
<section class="intro" id="intro1">
<h2 class="section-title">Introduction</h2>
<p class="content">
JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control
over them.
</p>
<p class="content">
JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it
with additional objects; for example:
</p>
<ul class="content-bullet">
<li class="bullet">Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events
such as mouse clicks, form input, and page navigation.</li>
<li class="bullet">Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from
one invocation to another of the application, or perform file manipulations on a server.</li>
</ul>
</section>
<section class="What-you-know" id="what2">
<h2 class="section-title">What you should already know</h2>
<p class="content">
This guide assumes you have the following basic background:
</p>
<ul class="content-bullet">
<li class="bullet">A general understanding of the Internet and the World Wide Web (WWW).</li>
<li class="bullet">Good working knowledge of HyperText Markup Language (HTML).</li>
<li class="bullet">Some programming experience. If you are new to programming, try one of the tutorials linked on the main page about JavaScript.</li>
</ul>
</section>
<section class="java" id="java3">
<h2 class="section-title">Javascript and Java</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Hello-world" id="hello4">
<h2 class="section-title">Hello World</h2>
<p class="content">
To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code:
</p>
<code>
function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");
</code>
<p class="content">
Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!
</p>
</section>
<section class="Variables" id="var5">
<h2 class="section-title">Variables</h2>
<p class="content">
You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules. A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also
be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase). You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can
also use the Unicode escape sequences as characters in identifiers. Some examples of legal names are Number_hits, temp99, and _name.
</p>
</section>
<section class="Declaring-variables" id="decl6">
<h2 class="section-title">Declaring variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Variable-scope" id="var6">
<h2 class="section-title">Variable-scope</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Global-variables" id="glob7">
<h2 class="section-title">Global Variables</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Constants" id="const8">
<h2 class="section-title">Constants</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
<section class="Data-types" id="data9">
<h2 class="section-title">Data types</h2>
<p class="content">
JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions
and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
</p>
<p class="content">
In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a runtime system based on a small number of data types representing numeric, Boolean, and string values. JavaScript has a prototype-based object model instead
of the more common class-based object model. The prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual objects. JavaScript also supports functions without any special declarative requirements.
Functions can be properties of objects, executing as loosely typed methods.
</p>
</section>
</main>
</div>
</body>
</html>
尝试准确指出与您的问题相关的代码部分。
这样就容易多了！
虽然我找不到导航顶部对齐 200 像素的原因。你可以这样修复它。
.navlink:last-child {
margin-bottom: 30px;
}
.navlink:first-child {
margin-top: 200px;
}