方法一：

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<span id=localtime></span>
<script type="text/javascript">
function showLocale(objD)
{
        var str,colorhead,colorfoot;
	var yy = objD.getYear();
	if(yy<1900) yy = yy+1900;
	var MM = objD.getMonth()+1;
	if(MM<10) MM = '0' + MM;
	var dd = objD.getDate();
	if(dd<10) dd = '0' + dd;
	var ww = objD.getDay();
	if  ( ww==0 )  colorhead="<font color=\"#cc0000\">";
	if  ( ww > 0 && ww < 6 )  colorhead="<font color=\"#cc0000\">";
	if  ( ww==6 )  colorhead="<font color=\"#cc0000\">";
	if  (ww==0)  ww="星期日";
	if  (ww==1)  ww="星期一";
	if  (ww==2)  ww="星期二";
	if  (ww==3)  ww="星期三";
	if  (ww==4)  ww="星期四";
	if  (ww==5)  ww="星期五";
	if  (ww==6)  ww="星期六";
	colorfoot="</font>"
	str = colorhead + yy + "年" + MM + "月" + dd + "日" + " " + ww + colorfoot;
	return(str);
}
function tick()
{
	var today;
	today = new Date();
	document.getElementById("localtime").innerHTML = showLocale(today);
	window.setTimeout("tick()", 1000);
}
tick();
</script>

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方法二：

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<span>今日：</span>
<script language="javascript">
function isnArray()
{
        argnr=isnArray.arguments.length
        for(var i=0;i<argnr;i++)
        {
                this[i+1]=isnArray.arguments[i];
        }
}
var isnDays=new isnArray("星期一","星期二","星期三","星期四","星期五","星期六","星期日");isnDays[0]="星期日";
mydate = new Date();
myyear = mydate.getFullYear();
mymonth = mydate.getMonth()+1;
today = mydate.getDate();
document.write(myyear+"年"+mymonth+"月"+today+"日");
document.write("&nbsp;")
document.write(isnDays[mydate.getDay()]);
</script>