javascript时钟

<script language="JavaScript" type="text/javascript">
         function nowTime(format) {
             var dt = new Date();
             //年份
             this.Year = dt.getFullYear();
             //月份
             this.Month = dt.getMonth() + 1;
             //日期
             this.Day = dt.getDate();
             //星期几,数字
             this.Week = dt.getDay();
             //星期几，中文
             this.WeekDay = '日一二三四五六'.charAt(dt.getDay());
             //24制小时
             this.Hours24 = dt.getHours();
             //12制小时
             this.Hours12 = this.Hours24 > 12 ? this.Hours24 - 12 : this.Hours24;
             //分钟
             this.Minutes = dt.getMinutes();
             //秒
             this.Seconds = dt.getSeconds();
             format = format.replace("yy", this.Year);
             format = format.replace("MM", this.Month);
             format = format.replace("dd", this.Day);
             format = format.replace("HH", this.Hours24);
             format = format.replace("hh", this.Hours12);
             format = format.replace("mm", this.Minutes);
             format = format.replace("ss", this.Seconds);
             format = format.replace("ww", this.Week);
             format = format.replace("WW", this.WeekDay);
             //时间显示在页面中哪个标签里，这里是其id
             this.toShow = function (element) {
                 document.getElementById(element).innerHTML = format;
             }
         }
</script>

调用

<div id="time" >
<script language="JavaScript" type="text/javascript" defer="defer">
    setInterval("new nowTime('yy年MM月dd日 HH:mm:ss 星期WW').toShow('time')", 1000);
</script></div>