String.prototype.format = function (args) {

             var result = this;

             if (arguments.length > 0) {

                 var reg;

                 if (arguments.length == 1 && typeof (args) == "object") {

                     for (var key in args) {

                         if (args[key] != undefined) {

                             reg = new RegExp("({" + key + "})", "g");

                             result = result.replace(reg, args[key]);

                         }

                     }

                 }

                 else {

                     for (var i = 0; i < arguments.length; i++) {

                         if (arguments[i] != undefined) {

                             reg = new RegExp("({)" + i + "(})", "g");

                             result = result.replace(reg, arguments[i]);

                         }

                     }

                 }

             }

             return result;

         }

         window.onload = function() {

             var template1 = "我是{0}，今年{1}了";

             var template2 = "我是{name}，今年{age}了";

             var result1 = template1.format("loogn", 22);

             var result2 = template2.format({ name: "loogn", age: 22 });

         };