javascript string.format

(function(window){
    function fn(str){
        this.str=str;
    }
 
    fn.prototype.format = function(){
        var arg = arguments;
        return this.str.replace(/\{(\d+)\}/ig,function(a,b){
             return arg[b]||"";
      });
    }
    window.fn = fn;
})(window);
 
//use
(function(){
    var t = new fn('<p><a href="{0}">{1}</a><span>{2}</span></p>');
    console.log(t.format('http://www.alibaba.com','Alibaba','Welcome'));
})();

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