javascript String.format

看了下没有在jquery里找到这方面的功能，也不知ASP.NET Ajax Library里是怎么实现这个的。

 

<script type="text/javascript">

//V1 method
String.prototype.format = function()
{
    var args = arguments;
    return this.replace(/\{(\d+)\}/g,               
        function(m,i){
            return args[i];
        });
}

 

//V2 static
String.format = function() {
    if( arguments.length == 0 )
        return null;

    var str = arguments[0];
    for(var i=1;i<arguments.length;i++) {
        var re = new RegExp('\\{' + (i-1) + '\\}','gm');
        str = str.replace(re, arguments[i]);
    }
    return str;
}

var a = "I Love {0}, and You Love {1},Where are {0}! {4}";
alert(String.format(a, "You","Me"));

alert(a.format("You","Me"));
</script>