如何从 CDN 和 HTML 代码中的 JS 脚本 link jQuery

How to link jQuery from a CDN and a JS script in HTML code

我很清楚这是一个有点白痴的问题,但我对 JS 和 JQuery 以及如何 link 它到 HTML 代码还很陌生,但是 none 的相似线程导致了解决方案。

奇迹般地,我发现并修改了一些 JSFiddle 代码:https://jsfiddle.net/z7L2re8j/

现在,我正在尝试从 CDN 加载 JQuery,我还有一个 JS 文件,其中包含使 HTML(和 CSS)正常工作的函数.

HTML的文件头:

<html>
  <head>
    <meta charset="UTF-8">
    <link rel="icon" href="images/icon.webp">
    <link rel="stylesheet" href="./new.css">
    <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous">  </script>
    <script type="text/javascript" src="./old.js"></script>
  </head>
  <body>
  <!-- Html body -->
  </body>
</html>

文件old.jsnew.css本质上是编写在JSFiddlelink中相应选项卡上的代码。 但是,当我 运行 带有 link 的 HTML 代码时,如您所见,它与 JSFiddle 中的预览不同。而且我不知道我做错了什么。

那么,我 link 是否正确地处理了文件,如果没有,我的错误是什么?

提前致谢

如果您的问题是如何 link 到 old.js 和 new.css,请查看网络选项卡并查看浏览器在哪里寻找它们

要将 CDN 用于 jQuery 和 Bootstrap 并从 JSFiddle 获取该信息,您可以这样做:

  1. 在 JSFiddle
  2. 中点击 资源

  1. 右击 links 并在新标签页中打开,你会看到它们是 Bootstrap v3.3.7

  2. 转到 https://getbootstrap.com/docs/5.0/getting-started/introduction/ and get the latest or search google first for bootstrap CDN: I found for example https://www.bootstrapcdn.com/ 然后您可以从那里获取您 want/need

    的版本

备选方案,因为我可以看到您的 JSFiddle 与 bootstrap 5 不兼容:

https://blog.getbootstrap.com/2016/07/25/bootstrap-3-3-7-released/

$('ul.nav li.dropdown').hover(function() {
  var first = $(this).find('.dropdown-menu')[0];
  $(first).stop(true, true).delay(20).fadeIn();
}, function() {
  $(this).find('.dropdown-menu').stop(true, true).delay(20).fadeOut();
});

$('ul.nav li#secondary').hover(function() {
  console.log("reached sub here 1");
  $(this).find('.sub-menu').stop(true, true).delay(20).fadeIn();
  console.log($(this).find('.sub-menu'));
}, function() {
  $(this).find('.sub-menu').stop(true, true).delay(20).fadeOut();
});

$('ul.nav li#third').hover(function() {
  console.log("reached sub here 1");
  $(this).find('.sub-menu').stop(true, true).delay(20).fadeIn();
  console.log($(this).find('.sub-menu'));
}, function() {
  $(this).find('.sub-menu').stop(true, true).delay(20).fadeOut();
});

$('ul.nav li#fourth').hover(function() {
  console.log("reached sub here 1");
  $(this).find('.sub-menu').stop(true, true).delay(20).fadeIn();
  console.log($(this).find('.sub-menu'));
}, function() {
  $(this).find('.sub-menu').stop(true, true).delay(20).fadeOut();
});
.navbar .sub-menu: before {
  border-bottom: 7px solid transparent;
  border-left: none;
  border-right: 7px solid rgba(0, 0, 0, 0.2);
  border-top: 7px solid transparent;
  left: -7px;
  top: 10px;
}

.navbar .sub-menu: after {
  border-top: 6px solid transparent;
  border-left: none;
  border-right: 6px solid #fff;
  border-bottom: 6px solid transparent;
  left: 10px;
  top: 11px;
}

.navbar-toggle {
  z-index: 3;
}

nav.navbar i.fa {
  padding-left: 5px;
  padding-right: 5px;
}

ul.nav li:hover>ul.dropdown-menu {
  display: block;
}

#navbar {
  text-align: center;
}

.dropdown-menu .sub-menu {
  left: 100%;
  position: absolute;
  top: 0;
  display: none;
  margin-top: -1px;
}

#navbar-collapse-new.navbar-collapse {
  padding-top: 0px;
  padding-right: 38px;
}
<!doctype html>
<html>

<head>
  <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous">
  </script>

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>  
  
</head>

<body>
  <nav class="navbar navbar-default" role="navigation" aria-label="Main Menu">
    <div class="container-fluid">

      <!-- Collect the nav links, forms, and other content for toggling -->
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                <ul class="dropdown-menu sub-menu" role="menu">
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