offset

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<html>
<head>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("button").click(function(){
    $("p").offsetParent().css("background-color","red");
  });
});
</script>
</head>
<body>
<div style="width:70%;position:absolute;left:100px;top:100px">
<div style="margin:50px;background-color:yellow">
<p>點擊下面的按鈕可以設置本段落的最近的父（祖先）元素的背景色。</p>
<div>
</div>
<button>點擊這里</button>
</body>
</html>
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