javascript给不能修改的函数增加额外处理的方法

不知道是否可行，但姑且google之。查看到相关的stack overflow(堆栈溢出）帖子：http://stackoverflow.com/questions/1659219/add-to-a-javascript-function 代码拷贝如下：

var originalFn = addToMe;addToMe =function(){  originalFn();// call the original function// other stuff}; addToMe =function(){  originalFn.apply(this, arguments);// preserve the arguments// other stuff}; addToMe =(function(originalFn){returnfunction(){    originalFn.apply(originalFn, arguments);// call the original function// other stuff};})(addToMe);// pass the reference of the original function 时间太晚，只试了一下第一种最简单的无参数的复写：

<html>
<head>
	<title>test</title>
	<script type="text/javascript" src="jquery.js"></script>
	<script type="text/javascript">     
    
    $(document).ready(function(){
    	$(":input[type='hidden']").bind("propertychange",function(){
    		alert($(this).val())
    	});
    });
    
    function addRow0(){
    	alert("simple ");
    }     
</script>
</head>
<body>
	<form>
		<input id="hf" type="hidden" value="" />
		
		<input type="button" value="test" onclick="$('#hf').val('fire')" />
		<input type="button" value="add hidden field" onclick="" />
		<input type="button" value="cache that" onclick="addRow0()" />
	</form>
</body>
<script type="text/javascript">
	function addHidden(){
		$("body").after("<input type='hidden' id='hf1' />");
	}
	var originalFn = addRow0;
	addRow0 = function () {
      originalFn();
      alert(" is the best");
  }
</script>
</html>

小伙伴们，有需要可以拿走玩一下。