Date.prototype.format =function(format) {     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; };