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());
  time_div.innerText = year + "年" + month + "月" + day + "日 " + hour + ":" + minute + ":" + second + " " + val;
}

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

setInterval("get_time()", 1000);