javascript 之string.format

function(){

    'use strict';



    if(String.prototype.format)

        return;

        

    String.prototype.format = function(args){

    

        var _dict = typeof(args) == 'object' ? args : arguments;

        

        return this.replace(/{([^{}]+)}/g,function(s,n){

            return _dict[n]===undefined?s:_dict[n];

        });

    

    };

    

})();

 

useage：

var str = '{name} is {age} years old.';

str.format({name:'Tom',age:25});//”Tom is 25 years old.”

str = '{0} is {1} years old.';

str.format('Jerry',15);//”Jerry is 15 years old.”

str.format(['Bill',10]);//"Bill is 10 years old."