var date = new Date();
  var year=date.getYear();
  var month=date.getMonth()+1;
  var day=date.getDate();
  var week = date.getDay();
  switch (date.getDay()){
    case 0: val = "星期日"; 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
  }
  
  time_div.innerText = "今天是： "+year+"年"+month+"月"+day+"日"+" "+val;