javascript 简单的回调函数

 1 var _temp_callback_key = null;
 2 function setCallBackFun(fun) {
 3     var date = new Date();
 4     var ticks = date.getTime() + "_callback";
 5     window[ticks] = fun;
 6     _temp_callback_key = ticks;
 7 }
 8 
 9 function getCallBackFun(isKeep) {
10     var temp = window[_temp_callback_key];
11     if (!isKeep)
12         window[_temp_callback_key] = null;
13     return temp;
14 }

 var fun = window.top.getCallBackFun(false);
                    fun(result);