【2011.09.01】如何使用javaScript代码获取系统时间和日期？

1.JS代码部分

<script type="text/javascript">
function show(time)
{
        var str ,colorhead,colorfoot;
        var year=time.getYear();         //获取年份
        var month=time.getMonth()+1;     //获取月份
        if(month<10) month='0'+month;
        var day=time.getDate();          //获取日期
        if(day<10) day='0'+day; 
        var hours=time.getHours();       //获取小时
        var minutes=time.getMinutes();   //获取分钟
        if(minutes<10) minutes='0'+minutes;
        var seconds=time.getSeconds();   //获取秒数
        if(seconds<10) seconds='0'+seconds;
        
        var week=time.getDay();         //获取星期
        if(week==0) colorhead="<font color=\"#FF0000\">";
        if  (week > 0 && week < 6)  colorhead="<font color=\"#FF0000\">";
        if  (week==6)  colorhead="<font color=\"#FF0000\">";
        if  (week==0)  week="星期日";
        if  (week==1)  week="星期一";
        if  (week==2)  week="星期二";
        if  (week==3)  week="星期三";
        if  (week==4)  week="星期四";
        if  (week==5)  week="星期五";
        if  (week==6)  week="星期六";
        colorfoot="</font>"
        str = colorhead + year + "-" + month + "-" + day + " " + hours + ":" + minutes + ":" + seconds + "  " + week
        + colorfoot;
        return(str);
}
function tick()           //设置每1秒更新一次
{
        var today;
        today = new Date();
        document.getElementById("study").innerHTML =show(today);
        window.setTimeout("tick()", 1000);
}
tick();
</script>

2.HTML代码部分

 <marquee direction="left" scrollamount="6" >
    <font>
       <span >
       <span >今天是：</span>
      <span ></span>
      </span>
   </font>
 </marquee>