插入节点insertBefore()

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>

<ul id="test"><li>JavaScript</li><li>HTML</li></ul> 
 
<script type="text/javascript">

  var otest = document.getElementById("test");  
  var newnode = document.createElement("li");
  newnode.innerHTML = "PHP";
  otest.insertBefore(newnode,otest.childNodes[1]);
</script> 

</body>
</html>

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原文地址：https://www.cnblogs.com/gide/p/4616628.html