Nodelist

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>test7</title>
 6 </head>
 7 <body>
 8     <div>old div</div>
 9     <script type="text/javascript" src="test7.js"></script>
10 </body>
11 </html>

1 var divs = document.getElementsByTagName("div");
2 
3 for (var i = 0, len = divs.length; i < len; i++) {
4     var div = document.createElement("div");
5     div.appendChild(document.createTextNode("new div"));
6     document.body.appendChild(div);
7 }