<!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>