[转]C#中的string.Format()的JS版本

 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 });
         };

来源:http://www.cnblogs.com/loogn/archive/2011/06/20/2085165.html