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

 

例：

var template1="我是{0}，今年{1}了"; var result1=template1.format("loogn",22); var template2="我是{name}，今年{age}了"; var result2=template2.format({name:"loogn",age:22});