function formatDate(now) { // 获取当前时间
    var newDate = now?new Date(now):new Date();
    var year=newDate.getFullYear();
    var month=newDate.getMonth()+1;
    var date=newDate.getDate();
    var hour=newDate.getHours();
    var minute=newDate.getMinutes();
    var second=newDate.getSeconds();
    if(month<10) month = "0" + month;
    if(date<10) date = "0" + date;
    if(hour<10) hour = "0" + hour;
    if(minute<10) minute = "0" + minute;
    if(second<10) second = "0" + second;
    return year+"-"+month+"-"+date+" "+hour+":"+minute+":"+second;
}