极客观点
项目管理
HarmonyOS
提示这个 是因为浏览器不支持吗？
<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">
window.onload=function () {
var oBtn1=document.getElementById('btn1');
var oComment=document.getElementById('comment');
var oComments=document.getElementsByClassName('comments');
var newdiv=oComments.cloneNode(true);
oComment.appendChild(newdiv);
}
</script>
</head>
<body>
<button id="btn1">按钮</button>
<div id="comment">
<div class="comments">
<div class="comments1">
<span id="username"><a href="#">aaa</a>:</span>
<span id="content">aaaaaaaaaaaaa</span>
</div>
<div class="comments2">
<span id="time">2017</span>
</div>
</div>
</div>
</body>
</html>
document.getElementsByClassName('comments')这个是NodeList