<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Title</title>
</head>
<body>
<!--DOM节点-->
<!--document object-->
<!--element object-->
<!--attribute object-->
<!--text object-->
<!--comment object-->
<div id="div1">
<div>hello star</div>
<p>hihi p</p>
</div>
<script>
var ele=document.getElementById('div1')
// alert(ele)//[object HTMLDivElement
// console.log(ele.nodeName);//DIV
// console.log(ele.nodeType);//1
// console.log(ele.nodeValue);//null
// var ele1=ele.firstChild;
// console.log(ele1.nodeName);//#text ---- DIV
// var ele2=ele.lastChild;
// console.log(ele2.nodeName);//text----P
// var ele3=ele.childNodes;
// console.log(ele3.length);//5
var ele3=ele.parentNode;
console.log(ele3.nodeName);//BODY
</script>
</body>
</html>