计时功能实现 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/jquery/1.8.3/jquery.js"></script>
    <title>计时器</title>
</head>
<body>
<div id="time"></div>
<script type="text/javascript">
    var timer = 0;
    setTimer();
    function setTimer(){
    timer++;
    var hh = parseInt(timer/3600);
    var ii = parseInt((timer/60)%60);
    var ss = parseInt(timer%60); 
    if(hh>99)return;
    if(hh<10)hh = "0"+hh;
    if(ii<10)ii = "0"+ii;
    if(ss<10)ss = "0"+ss;
    $("#time").html(hh+":"+ii+":"+ss);
    t = setTimeout("setTimer()",1000);
    }
</script>
</body>
</html>

 

posted @ 2017-10-23 11:06  learn_by_doing  阅读(136)  评论(0)    收藏  举报