js 钩子(hook)

var setHook  = (function () {
       function doSomeThing(attr, doSomeThings) {
           var tempFunction = this[attr];
           var that = this;
           this[attr] = function () {
               doSomeThings.apply(that, Array.prototype.slice.call(arguments));
               return tempFunction.apply(that, Array.prototype.slice.call(arguments));
           }
       }

       function setHook(obj, attr, doSomeThings) {
           doSomeThing.call(obj, attr, doSomeThings);
       }

       return setHook;
   })()


   setHook(Math, 'max', function () {
       console.log(arguments)
   })

   alert(Math.max(2, 3, 4, 5, 6, 7, 8))//8

ok!自己写的 有什么错误希望指正哈！