javascript中获取时间效果

1.获取当前时间

<script type="text/javascript">

  var now=new Date();

  var hour=now.getHours();var minu=now.getMinut();

alert("您好！现在是"+hour+":"+minu+"\r欢迎访问明日科技图书网！");

  </script>

2.获取今天星期几

var now=new Date();

var week=now.getDay();

switch(week){

case 1:

alert("星期一");break;

case 2:

alert("星期二");break;

case 3:

alert("星期三");break;

case 4:

alert("星期四");break;

case 5:

alert("星期五");break;

case 6:

alert("星期六");break;

case 7:

alert("星期天");break;

default:

alert("出错了！");

}

3.获取年月日星期几

function getClock(clock){
var now=new Date();
var year=now.getFullYear();
var month=now.getMonth();
var date=now.getDate();
var day=now.getDay();
var arr_week=new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
var week=arr_week[day];
var time=year+"年"+month+"月"+date+"日"+week;
clock.innerHTML="系统公告:"+time;

}