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html_and_css_and_js_exercises
/
JS.html

<html>
<head>
<script type="text/javascript">

function set_open(){
var today=Date();
alert(today);
var timer=setTimeout("set_open()",2000); alert(timer);}
function showTime(){
var today = new Date(); //获得当前时间
var yy=today.getFullYear();
var zz=today.getDay();
var mmm=today.getMonth();
var rr=today.getDate();
var hh = today.getHours();
var mm = today.getMinutes();
var ss = today.getSeconds();
switch (zz)
{
case 0: var ZZ="星期日";break;
case 1: var ZZ="星期一";break;
case 2: var ZZ="星期二";break;
case 3: var ZZ="星期三";break;
case 4: var ZZ="星期四";break;
case 5: var ZZ="星期五";break;
case 6: var ZZ="星期六";break;
}
/*设置div的内容为当前时间*/
document.getElementById("myclock").innerHTML=" <p>您当前的系统时间是: "+yy+"年"+mmm+"月"+rr+"日"+hh+":" +mm+":"+ss+"     "+ZZ+"</p> ";

}
var timer=setInterval("showTime()",2000);
</script>
</head>
<body>
<input type="button"    value="点击" onclick="set_open()"/>
<div id="myclock"> </div>
</body>
</html>