  function get_time()
  {
    var date=new Date();
    var year="",month="",day="",week="",hour="",minute="",second="";
    year=date.getYear();
    month=add_zero(date.getMonth()+1);
    day=add_zero(date.getDate());
    week=date.getDay();
    switch (date.getDay()) {
    case 0:val="星期天";break
    case 1:val="星期一";break
    case 2:val="星期二";break
    case 3:val="星期三";break
    case 4:val="星期四";break
    case 5:val="星期五";break
    case 6:val="星期六";break
      }
    hour=add_zero(date.getHours());
    minute=add_zero(date.getMinutes());
    second=add_zero(date.getSeconds());
    timetable.innerText=" "+year+"年"+month+"月"+day+"日 "+val+" "+hour+":"+minute+":"+second;
  }

  function add_zero(temp)
  {
    if(temp<10) return "0"+temp;
    else return temp;
  }
setInterval("get_time()",1000);