JQ fn扩展方法
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<span>click here</span>
<script type="text/javascript" src="http://s.thsi.cn/cb?js/;jquery-1.8.3.min.js"></script>
<script>
$.fn.extend({
showName:function(){
$(this).click(function(){
alert($(this).html());
});
}
});
$("span").showName();
</script>
</body>
</html>
