本文实例介绍了javascript动态获取登录时间和在线时长的相应代码，分享给大家供大家参考，具体内容如下
效果图：
实现代码：
<html>
<head>
<title>online</title>
<script language=javaScript>
///这里是获得登录时候的时间，用来和动态的时间做差来求时长
var s = new Date();
function clockon() {
var thistime = new Date();
//时间差
diff = new Date();
diff.setTime(Math.abs(thistime.getTime() - s.getTime()));
timediff = diff.getTime();
hos = Math.floor(timediff / (1000 * 60 * 60));
mins = Math.floor(timediff / (1000 * 60));
secs = Math.floor(timediff / 1000);
//end
var hours = thistime.getHours();
var minutes = thistime.getMinutes();
var seconds = thistime.getSeconds();
if (eval(hours) < 10) {
hours = "0" + hours;
}
if (eval(minutes) < 10) {
minutes = "0" + minutes;
}
if (seconds < 10) {
seconds = "0" + seconds;
}
thistime = hours + ":" + minutes + ":" + seconds;
bgclockshade.innerHTML = thistime//这里动态的嵌入当前的时间
//如果不取余的话，秒数是一直上升的，所以在达到一个60的时候就取余就可以解决这个问题了
if (secs > 59) {
secs = secs % 60;
}
if (mins > 59) {
mins = mins % 60;
}
if (eval(secs) < 10) {
secs = "0" + secs;
}
if (eval(mins) < 10) {
mins = "0" + mins;
}
if (eval(hos) < 10) {
hos = "0" + hos;
}
jishi.innerHTML = hos + ":" + mins + ":" + secs;
var timer = setTimeout("clockon()", 200);
}
</script>
</head>
<body onload="clockon();">
登录时间：
<div id="bgclockshade"></div>
上网时长：
<div id="jishi"></div>
</body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助。