Javascript String formatTime(template)

String.prototype.formatTime= function(template){
    var template = template || '{0}?{1}?{2]?{3]?{4}?{5}?';
    var ary = this.match(/\d+/g);
    tmplate = template.replace(/{(\d+)}/g, function(){
        var index = arguments[1];
        this.result = ary[index];// w w w . ja v a 2 s.  c  om
        this.result = this.result || '00';
        this.result.length<2? this.result = '0'+ this.result:null;
        return this.result;
    });

    return tmplate;
}