實作原理：擷取目前伺服器時間，然後進行拆分後再合并，并應用 定時器，注意月份是0 到11
<!DOCTYPE html>
<html>
<head>
<title>時鐘</title>
<script type="text/javascript">
window.onload = function(){
var oDiv = document.getElementsByTagName('div')[0];
//alert(oDiv);
function fnTimeGo(){
var sNow = new Date();
var iYear = sNow.getFullYear();
var iMonth = sNow.getMonth()+1;
var iDay = sNow.getDate();
var iWeek = sNow.getDay();
var iHore = sNow.getHours();
var iMin =sNow.getMinutes();
var iSecond = sNow.getSeconds();
var Str = '中原標準時間：'+iYear+'年'+iMonth+'月'+iDay+'日 '+ fnToweek(iWeek) +' '+ fnTodou(iHore)+':'+fnTodou(iMin)+':'+fnTodou(iSecond);
oDiv.innerHTML = Str
}
//先行調用一次，解決1秒延遲問題
fnTimeGo();
//設定定時器，每隔1秒更新一次時間
setInterval(fnTimeGo,1000);
function fnToweek(i){
if(i==0){return '星期日'}
else if(i==1){return '星期一'}
else if(i==2){return '星期二'}
else if(i==3){return '星期三'}
else if(i==4){return '星期四'}
else if(i==5){return '星期五'}
else {return '星期六'}
}
function fnTodou(i){
if(i<10){return '0'+i ;}
else return i ;
}
}
</script>
<style type="text/css">
div{
text-align: center;
font-size: 30px;
color: gold;
}
</style>
</head>
<body>
<div id="div1"></div>
</body>
</html>
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