【JSP】JSP动态显示时间

 function showtime() {
     var today;
     var hour;
     var second;
     var minute;
     var year;
     var month;
     var date;
     var strDate;
     today = new Date();
     var n_day = today.getDay();
     switch (n_day) {
     case 0: {
         strDate = "星期日"
     }
         break;
     case 1: {
         strDate = "星期一"
     }
         break;
     case 2: {
         strDate = "星期二"
     }
         break;
     case 3: {
         strDate = "星期三"
     }
         break;
     case 4: {
         strDate = "星期四"
     }
         break;
     case 5: {
         strDate = "星期五"
     }
         break;
     case 6: {
         strDate = "星期六"
     }
         break;
     case 7: {
         strDate = "星期日"
     }
         break;
     }
     year = today.getYear() - 100 + 2000;
     month = today.getMonth() + 1;
     date = today.getDate();
     hour = today.getHours();
     minute = today.getMinutes();
     second = today.getSeconds();
     if (month < 10)
         month = "0" + month;
     if (date < 10)
         date = "0" + date;
     if (hour < 10)
         hour = "0" + hour;
     if (minute < 10)
         minute = "0" + minute;
     if (second < 10)
         second = "0" + second;
     document.getElementById('clock').innerHTML = year + "年" + month + "月"
             + date + "日 " + strDate + " " + hour + ":" + minute + ":" + second;
     setTimeout("showtime();", 1000);
 }

 <body onLoad="showtime()">
     <span style="float:left">
         <span>当前时间</span>
         <span id="clock"></span>
     </span>
 </body>