Date.prototype.format = function(format) {   
   /*  
     * eg:format="YYYY-MM-dd hh:mm:ss";  
     */  
    var o = {   
        "M+" :this.getMonth() + 1, // month   
        "d+" :this.getDate(), // day   
        "h+" :this.getHours(), // hour   
        "m+" :this.getMinutes(), // minute   
        "s+" :this.getSeconds(), // second   
        "q+" :Math.floor((this.getMonth() + 3) / 3), // quarter   
        "S" :this.getMilliseconds()   
    // millisecond   
    }   
  
    if (/(y+)/.test(format)) {   
        format = format.replace(RegExp.$1, (this.getFullYear() + "")   
                .substr(4 - RegExp.$1.length));   
   }   
  
    for ( var k in o) {   
        if (new RegExp("(" + k + ")").test(format)) {   
            format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k]   
                   : ("00" + o[k]).substr(("" + o[k]).length));   
        }   
    }   
    return format;   
}