<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JS 实时的时间</title>
</head>
<script>
function startTime(){
var today=new Date();
var h=today.getHours();
var m=today.getMinutes();
var s=today.getSeconds();// 在小于10的数字 前加一个‘0’
m=checkTime(m);
s=checkTime(s);
document.getElementById('txt').innerHTML=h+":"+m+":"+s;
t=setTimeout(function(){startTime()},500);
}
function checkTime(i){
if (i<10){
i="0" + i;
}
return i;
}
</script>
<body onload="startTime()">
<div id="txt"></div>
</body>
</html>