方法二：

<script type="text/javascript">        
          //以下是年月日星期显示
       tmpDate = new Date(); date = tmpDate.getDate(); month = tmpDate.getMonth() + 1; year = tmpDate.getYear(); document.write(year); document.write("."); document.write(month); document.write("."); document.write(date); document.write("&nbsp;"); myArray = new Array(6);
          myArray[0] = "星期日 "
          myArray[1] = "星期一 "
          myArray[2] = "星期二 "
          myArray[3] = "星期三 "
          myArray[4] = "星期四 "
          myArray[5] = "星期五 "
          myArray[6] = "星期六 "
          weekday = tmpDate.getDay(); if (weekday == 0 | weekday == 6) {
              document.write(myArray[weekday])
          } else {
              document.write(myArray[weekday])
          };

//以下是时间显示
var tags_before_clock = ""
var tags_after_clock = ""

if(navigator.appName == "Netscape") {
document.write('<layer id="clock"></layer>');
}

if (navigator.appVersion.indexOf("MSIE") != -1){
document.write('<span id="clock"></span>');
}

function showclock()
{
var date = new Date();
var hour = date.getHours();
var min = date.getMinutes();
var sec = date.getSeconds();
var col = ":";
var spc = " ";
var apm;

if ( hour >24 )
{
apm="P.M.";
hour=hour-24;
}
else
{
apm="A.M.";
}

if (hour == 0) hour=24;
if (min<=9) min="0"+min;
if (sec<=9) sec="0"+sec;

if(navigator.appName == "Netscape")
{
document.clock.document.write(tags_before_clock
+hour+col+min+col+sec+spc+tags_after_clock);
document.clock.document.close();
}

if (navigator.appVersion.indexOf("MSIE") != -1)
{
clock.innerHTML = tags_before_clock+hour+col+min+col+sec;
}
}
setInterval("showclock()",1000);
 </script>