document.title 个问题 Javascript

Question

我是 JS 的新手，正在学习 JON DUCKETT 的 JAVASCRIPT 和 JQUERY 一本书。

我对 document.title 用法的问题感到震惊

我写了一个关于如何使用文档的代码 objects。

每个属性和方法都有效，除了标题

我附上了一个代码，请看一下并帮助我如何获得标题属性工作中。

代码如下：

<!DOCTYPE html>
<html>
<head>
  <title>Hammer</title>
</head>
<body>
  <h1>THANOS</h1>
  <div id="tony"></div>
</body>
<script>
    var lord = "<p> The title of the page is :" + document.title + "</p>";             
     
     lord += "<p>address of the page is : " + document.URL + "</p>";

     lord += " <p>Last modified is : " + document.lastModified + "</p>";

     var man = document.getElementById("tony");
     man.innerHTML = lord;
</script>
</html>

输出：灭霸

 The title of the page is : 

 address of the page is : https://fiddle.jshell.net/_display/

 Last modified is : 07/14/2018 10:28:57

为什么不显示标题？

代码中的+=是什么意思请大家帮忙

抱歉，我没有 10 到 post 图像的声誉我必须编写此代码。

Answer 1

您的代码已打开，只是 jsfiddle 将标题设置为空。见 jsbin http://jsbin.com/yorivec/edit?html,output

<!DOCTYPE html>
<html>
<head>
  <title>Hammer</title>
</head>
<body>
  <h1>THANOS</h1>
  <div id="tony"></div>
</body>
<script>
  var lord = "<p> The title of the page is :" + document.title + "</p>";             
  lord += "<p>address of the page is : " + document.URL + "</p>";
  lord += " <p>Last modified is : " + document.lastModified + "</p>";
  var man = document.getElementById("tony");
  man.innerHTML = lord;
</script>
</html>

Answer 2

您的代码确实有效。点击下面的 运行代码 按钮即可实时观看：

var lord = "<p> The title of the page is :" + document.title + "</p>";             

 lord += "<p>address of the page is : " + document.URL + "</p>";

 lord += " <p>Last modified is : " + document.lastModified + "</p>";

 var man = document.getElementById("tony");

 man.innerHTML = lord;

<!DOCTYPE html>
<html>
<head>
<title>Hammer</title>
</head>
 <body>
 <h1>THANOS</h1>
 <div id="tony"></div>
</body>
</html>

而且，当我们用任何编程语言（不仅仅是JavaScript）编写类似a += b的东西时，它只是一个shorthand来编写a = a + b。仅此而已。 :)

Answer 3

请检查所有代码给你好

<!DOCTYPE html>
<html>
<head>
<title>Hammer</title>
 <script>

 function myFunction() {
    var d = new Date();
    document.getElementById("time").innerHTML="last update:"+d;
    document.getElementById("url").innerHTML="url:"+window.location.href+".....current page....."+window.location.pathname+".........websitename......"+window.location.hostname;
    
      document.getElementById("title").innerHTML="Title:"+document.title;
   
 
 }
 
 </script>
 <style>
 body {
    font-family: Calibri, sans-serif;
    font-size:15px;
    line-height:1.5;
    padding:0;
    margin:0;
    background-color: #f4f4f4;
}

 </style>

</head>
<body>

<h1 id="title">This is a Headhing</h1>
<p id="url">This is a paragraph.</p>
<p id="time">This is a paragraph.</p>


<button onclick="myFunction()">Try it</button>

</body>
</html>

document.title 个问题 Javascript

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