[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