String.prototype.format = function (args) {            if (arguments.length > 0) {                var result = this;                if (arguments.length == 1 && typeof (args) == "object") {                    for (var key in args) {                        var reg = new RegExp("({" + key + "})", "g");                        result = result.replace(reg, args[key]);                    }                }                else {                    for (var i = 0; i < arguments.length; i++) {                        if (arguments[i] == undefined) {                            return "";                        }                        else {                            var reg = new RegExp("({[" + i + "]})", "g");                            result = result.replace(reg, arguments[i]);                        }                    }                }                return result;            }            else {                return this;            }        }

//两种调用方式 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=template1.format({name:"loogn",age:22}); //两个结果都是"我是loogn，今年22了"