<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#div1{
200px;
height: 200px;
background: #ccc;
margin: 100px;
position: relative;
}
#div2{
100px;
height: 100px;
background: red;
position: absolute;
left: 50px;
top: 50px;
}
</style>
<script>
//父级有定位的时候 offsetParent 获取的就是父节点
//父级没有定位的时候 获取的就是body
window.onload = function(){
var oDiv2 = document.getElementById("div2");
alert(oDiv2.offsetParent);
}
</script>
</head>
<body>
<div id="div1">
<div id="div2"></div>
</div>
</body>
</html>
和parentNode