$.get的重写

 window.meng = window.meng || {};
 (function () {

     function Get() {
         this.def = $.Deferred();
     }

     Get.prototype.request = function (url) {
         $.get(url, function (data) {
             this.def.resolve(data);
         }.bind(this));
         return this.def;
     };
     meng.Get = Get;
 })();

网上的一篇好文章：http://www.ruanyifeng.com/blog/2011/08/a_detailed_explanation_of_jquery_deferred_object.html