javascript - 如何在类标签内显示 "grab"内容并仅使用 javascript 显示内容？

Question

我不确定我的方向是否正确，但我想要实现的目标非常复杂，至少对我来说是这样。所以我正在寻找的是在 html 类标签中找到内容，并在我想要的任何地方显示这些内容。以一个网站上的在线产品为例，假设标题上的代码是这样写的:

< h2 class="Title">This is a product example< /h2>|| note the space had
  to be to show the exact code.

Yes, I know that i could just use the variable like:

 < h2>$title< /h2> 

But what if don't have access to it? Is there any chance of getting them details using :getElementByClassName And then display that content? I have been looking all over and I, unfortunately got nothing, therefore decided to ask here.

HTML:

<div id="container"> ABC <br />
<p class="displayThis"> I want this to be displayed again
using only JavaScript </p
</div>

风格:

 
    #container {
    border: 1px solid;
    width: 200px;
    margin-left: 15%;
    background: #999;
    border-color: #fc0000;
    text-align: center;
   }
.displayThis {
    background: #999;
    color: #fff;
    font-weight: bold;
}


.newContent {
    position: fixed;
    bottom: 10%;
    right: 50%;
    font-weight: bold;
}

Script:

var displayThys = document.getElementByClassName("displayThis");

document.write('\<p class="newContent">'+ displayThys +'</p>\ <br />\ ');

这是JsFiddle

Answer 1

HTML

<div id="container"> ABC <br />
    <p class="displayThis"> I want this to be displayed again using only JavaScript </p>
</div>

这是脚本

<script>
    (function(){
        var a = document.getElementsByClassName("displayThis");

        for (var i = 0; i < a.length; i++) {
        var displayAgain = a[i];
        document.write('\<p class="newContent">'+ displayAgain.innerHTML +'</p>\ <br />\ ');

        }
    })();
</script>

---

代码本身是不言自明的