js得到格式化得时间

    var date = new Date(); //日期对象
    var now = "";
    now = date.getFullYear()+"-";
    now = now + ((date.getMonth()+1)<10?"0"+(date.getMonth()+1):(date.getMonth()+1)) +"-";
    now = now + (date.getDate()<10?"0"+date.getDate():date.getDate()) +" ";
    now = now + (date.getHours()<10?"0"+date.getHours():date.getHours()) +":";
    now = now + (date.getMinutes()<10?"0"+date.getMinutes():date.getMinutes()) +":";
    now = now + (date.getSeconds()<10?"0"+date.getSeconds():date.getSeconds()) +"";
    alert(now);

输出的结果是 2011-05-05 15:21:40