javascript獲取當前日期和時間

function GetDate(format) {
     /**
 * format=1表示獲取年月日
     * format=0表示獲取年月日時分秒
     * **/
     var now = new Date();
     var year = now.getFullYear();
     var month = now.getMonth()+1;
     var date = now.getDate();
     var day = now.getDay();//得到周幾
     var hour = now.getHours();//得到小時
     var minu = now.getMinutes();//得到分鍾
     var sec = now.getSeconds();//得到秒
     if (format==1){
         _time = year+"-"+month+"-"+date
    }
    else if (format==2){
        _time = year+"-"+month+"-"+date+" "+hour+":"+minu+":"+sec
    }
    return _time
}    

alert("當前日期為: " + GetDate(0));