方法一：
<!--setInterval實時顯示時間-->
<p id="time1" style="color: blueviolet;"></p>
<script>
function mytime(){
var a = new Date();
var b = a.toLocaleTimeString();
var c = a.toLocaleDateString();
document.getElementById("time1").innerHTML = c+" "+b;
}
setInterval(function() {mytime()},);
</script>
方法二：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">
function getTime() {
var dateObj = new Date();
var year = dateObj.getFullYear();//年
var month = dateObj.getMonth()+;//月 (注意：月份+1)
var date = dateObj.getDate();//日
var day = dateObj.getDay();
var weeks = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var week = weeks[day];//根據day值，擷取星期數組中的星期數。
var hours = dateObj.getHours();//小時
var minutes = dateObj.getMinutes();//分鐘
var seconds = dateObj.getSeconds();//秒
if(month<){
month = "0"+month;
}
if(date<){
date = "0"+date;
}
if(hours<){
hours = "0"+hours;
}
if(minutes<){
minutes = "0"+minutes;
}
if(seconds<){
seconds = "0"+seconds;
}
var newDate = year+"年"+month+"月"+date+"日"+hours+":"+minutes+":"+seconds+"   "+week;
document.getElementById("date1").innerHTML = "時間顯示：" + newDate;//在div中寫入時間
setTimeout('getTime()', );//每隔500ms執行一次getTime()
}
</script>
<title>實時顯示時間</title>
</head>
<body onload="getTime()">
<div id="date1"></div>
</body>
</html>
差別：
*setInterval在執行完一次代碼之後，經過了那個固定的時間間隔，它還會自動重複執行代碼。
而setTimeout隻執行一次那段代碼。*
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