JavaScript里String.Format方法的实现

在Javascript里通过原型扩展和正则表达式实现类似于C#里的String.Format方法.

方法实现:

 

String.prototype.format = function (args) {

       var str = this;

       return str.replace(new RegExp("{-?[0-9]+}", "g"), function(item) {

       var intVal = parseInt(item.substring(1, item.length - 1));

       var replace;

       if (intVal >= 0) {

            replace = args[intVal];

       } else if (intVal === -1) {

            replace = "{";

       } else if (intVal === -2) {

            replace = "}";

       } else {

            replace = "";

       }

       return replace;

    });

};

 使用如下:

var str = "She {1} {0}{2} by the {0}{3}. {-1}^_^{-2}";

str = str.format(["sea", "sells", "shells", "shore"]);

alert(str);//out put: She sells seashells by the seashore. {^_^}

原文地址:String.Format in JavaScript