http://blog.youkuaiyun.com/cike121272604/article/details/5809114
<html>
<body><div id="a">
<div id="a1">1</div>
<div id="a2">2</div>
</div>
<a href="javascript:addDiv();">test</a>
</body>
<script type="text/javascript">
function addDiv(){
var newNode=document.createElement("div");
newNode.setAttribute("id","a3");
var txtNode=document.createTextNode("3");
newNode.appendChild(txtNode);
document.getElementById("a").insertBefore(newNode,document.getElementById("a2"));
alert(document.getElementById("a").innerHTML)
}
</script>
</html>
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