javaScript实现自动时钟

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>定时函数</title>
</head>

<body>
<h3>当前时间为:<span id="time"></span></h3>

<script>
//定时函数
//时间间隔函数
function show(){
//拿到系统时间对象
var date = new Date();
//获取时分秒
var hour = date.getHours();
var minute = date.getMinutes();
var second = date.getSeconds();
if(hour<10){
hour="0"+hour;
}
if(minute<10){
minute = "0"+minute;
}
if(second<10){
second = "0"+second;
}
var time = hour+":"+minute+":"+second;

//获取span标签
var span = document.getElementById("time");
span.innerHTML = time;
return show;
}
show();
window.setInterval(show(),1000);
</script>
</body>
</html>

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