<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="Scripts/jquery-1.7.1.min.js"></script>
<title></title>
<style type="text/css">
</style>
<script type="text/javascript">
$(function () {
$(document).click(function (event) {
alert($(event.target).isChildAndSelfOf("#d1"));
// alert($(event.target).closest("#d1").length);//closest() 方法获得匹配选择器的第一个祖先元素，从当前元素开始沿 DOM 树向上。
});
});
jQuery.fn.isChildAndSelfOf = function (b) {
return (this.closest(b).length > 0);
};
</script>
</head>
<body>
<div style="width:200px;height:200px;background-color:lightblue" id="d1">
<ul>
<li>1111111111</li>
<li>1111111111</li>
<li>1111111111</li>
<li>1111111111</li>
<li>1111111111</li>
<li>1111111111</li>
</ul>
</div>
<div style="width:200px;height:200px;background-color:yellow" id="d2">
aaaa
</div>
<div style="width:200px;height:200px;background-color:green" id="d3">
aaaa
</div>
</body>
</html>
