insertBefore Method --------------------------------------------------------------------------------Inserts an element into the document hierarchy as a child node of a parent object.
oElement = object.insertBefore(oNewNode [, oChildNode])
oElement = object.insertBefore(oNewNode [, oChildNode])
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<Script language="javascript">
function btn_click()
{
var div1 = document.createElement("div");
div1.id = "r";
div1.innerText = "r";
document.getElementById("div").insertBefore(div1,document.getElementById("div_5")); var div2 = document.createElement("div");
div2.id = "t";
div2.innerText = "t";
document.getElementById("div").insertBefore(div2,div1);} </script>
</head><body>
<div id="div">
<div id="div_1"> div_1</div>
<div id="div_2"> div_2</div>
<div id="div_5"> div_5</div>
<div id="div_7"> div_7</div>
<div id="div_4"> div_4</div>
<div id="div_0"> div_0</div>
</div>
<input type = "button" onclick="javascript:btn_click()" value="插入几个元素">
</body>
</html>