没太懂
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> </head> <body> <div> javascript <p>javascript</p> <div>jQuery</div> <h5>PHP</h5> </div> <script type="text/javascript"> var x=document.getElementsByTagName("div")[0].childNodes; for(var i=0;i<x.length;i++){ document.write("节点类型:"+x[i].nodeName+" "+x[i].nodeType+" "+x[i].nodeValue+"<br />"); } </script> </body> </html>
http://www.imooc.com/code/1589 看一下这节中的讲解 元素节点的 nodeValue 是 undefined 或 null