javaScript倒计时程序

最新推荐文章于 2024-10-25 14:45:47 发布

原创最新推荐文章于 2024-10-25 14:45:47 发布 · 1.7k 阅读

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#javascript #xhtml #html #button #function #input

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML1.0 Transitional //EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<html xmlns=" http://www.w3.org/1999/xhtml" lang="gb2312">
<meta http-equiv="Content-type" content="text/html;charset=gb2312" />
<head>
   <title>No.Javascript倒计时演示</title>
</head>
<BODY>
<input type="button" id="agree" value="还剩下(50)分钟">
</BODY>
</HTML>
<script type="text/javascript">
var settime=50;
var i;
var showthis;
document.all.agree.disabled=true;
for(i=1;i<=settime;i++)   {
     setTimeout("update("+i+")",i*1000);
}
function update(num) {
     if(num==settime) {
document.all.agree.value="我同意";
document.all.agree.disabled=false;
   }
   else {
   showthis=settime-num;
   document.all.agree.value="还剩下 ("+showthis+")";
   }
}
</script>