本文介绍的js复制粘贴功能的实现是借助于textarea和document.execCommand来实现将文本复制到粘贴板上，具体的代码如下：
<!DOCTYPE html>
<html>
<head>
<title>copy</title>
<style type="text/css">
.top {
width: 300px;
height: 200px;
position: absolute;
z-index: 2;
background: #fff;
overflow: hidden;
}
.bottom {
width: 300px;
height: 200px;
position: absolute;
z-index: 1;
overflow: hidden;
}
#btn {
height:30px;
text-align:center;
border:1px #00a2ca solid;
cursor:pointer
};
#btn:hover {
background:#00a2ca;
color:#fff
};
</style>
<script type="text/javascript">
var copy = function(){
debugger;
var wrapper = document.getElementById("wrapper");
var content = document.getElementById("content");
wrapper.value = content.innerHTML;
wrapper.select();
document.execCommand("Copy");
alert("复制成功！");
}
</script>
</head>
<body>
<!-- 通过遮罩将这个textarea隐藏起来，这样就不会影响页面的样式了 -->
<div class="bottom">
<textarea id="wrapper">dasdas</textarea>
</div>
<div class="top">
<p id="content">dadasdasdas</p>
<span id="btn" onclick="copy()">复制</span>
</div>
</body>
</html>来源：CSDN
作者：一直在梦想路上
链接：https://blog.csdn.net/qq_24689783/article/details/78875776