js string format

 1  <script type="text/javascript">
 2 
 3 //V1 method
 4 String.prototype.format = function()
 5 {
 6     var args = arguments;
 7     return this.replace(/\{(\d+)\}/g,               
 8         function(m,i){
 9             return args[i];
10         });
11 }
12 
13 //V2 static
14 String.format = function() {
15     if( arguments.length == 0 )
16         return null;
17 
18     var str = arguments[0];
19     for(var i=1;i<arguments.length;i++) {
20         var re = new RegExp('\\{' + (i-1) + '\\}','gm');
21         str = str.replace(re, arguments[i]);
22     }
23     return str;
24 }
25 
26 var a = "I Love {0}, and You Love {1},Where are {0}! {4}";
27 alert(String.format(a, "You","Me"));
28 
29 alert(a.format("You","Me"));
30 </script>
31 
32