js setInterVal()實時顯示時間、日期

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>js setInterVal()實時顯示時間、日期</title>
<script>
window.onload = displayDate;	
function displayDate(){
	var date = new Date();
	var year = date.getFullYear();
	
	var month = date.getMonth()+1;
	month = ((month < 10)?"0":"") + month;
	var day = date.getDate();
	day = ((day < 10)?"0":"") + day;
	
	var hours = date.getHours();
	hours = ((hours < 10)?"0":"") + hours;
	
	var minutes  = date.getMinutes();
	minutes = ((minutes < 10)?"0":"") + minutes;
	
	var seconds = date.getSeconds();
	seconds = ((seconds<10)?"0":"") + seconds;
	
	var a = new Array("日","一","二","三","四","五","六");
	var day1 = date.getDay();
	day1 = "星期" + a[day1];
	
	var currenttime = year + "年" + month + "月" + day + "日 " + hours + ":" + minutes + ":" + seconds + " " + day1;
	document.getElementById("demo").innerHTML = currenttime;
	
}
var  timer = window.setInterval(displayDate,1000);
function stopTimer(){
	window.clearInterval(timer);
}
</script>
</head>
<body>

<p id="demo"></p>
<button οnclick="stopTimer();" style="width:240px;">Stop</button>
	
</body>
</html>
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