刚写完分享下答案
<!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 id="con">-->
<!-- <p>javascript</p>-->
<!-- <div>jQuery</div>-->
<!-- <h5>PHP</h5>-->
<!--</div>-->
<div id="con"><p>javascript</p><div>jQuery</div><h5>PHP</h5></div>
<script type="text/javascript">
var x=document.getElementById("con");
function write(a){
document.write("节点的名称:"+a.nodeName+"<br/>");
document.write("节点的值:"+a.nodeValue+"<br/>");
document.write("节点的类型:"+a.nodeType+"<br/>");
document.write("-----------------------"+"<br/>");
}
write(x.firstChild);
write(x.lastChild);
</script>
</body>
</html>