<html>
     <head>
         <title>網(wǎng)頁中動態(tài)的顯示系統(tǒng)日期時間</title>
         <script language="JavaScript">
             function startTime() {
                 var today = new Date(); //定義日期對象   
                 var yyyy = today.getFullYear(); //通過日期對象的getFullYear()方法返回年    
                 var MM = today.getMonth() + 1; //通過日期對象的getMonth()方法返回年    
                 var dd = today.getDate(); //通過日期對象的getDate()方法返回年     
                 var hh = today.getHours(); //通過日期對象的getHours方法返回小時   
                 var mm = today.getMinutes(); //通過日期對象的getMinutes方法返回分鐘   
                 var ss = today.getSeconds(); //通過日期對象的getSeconds方法返回秒   
                 // 如果分鐘或小時的值小于10，則在其值前加0，比如如果時間是下午3點20分9秒的話，則顯示15：20：09   
                 MM = checkTime(MM);
                 dd = checkTime(dd);
                 mm = checkTime(mm);
                 ss = checkTime(ss);
                 var day; //用于保存星期（getDay()方法得到星期編號）
                 if (today.getDay() == 0) day = "星期日 "
                 if (today.getDay() == 1) day = "星期一 "
                 if (today.getDay() == 2) day = "星期二 "
                 if (today.getDay() == 3) day = "星期三 "
                 if (today.getDay() == 4) day = "星期四 "
                 if (today.getDay() == 5) day = "星期五 "
                 if (today.getDay() == 6) day = "星期六 "
                 document.getElementById('nowDateTimeSpan').innerHTML = yyyy + "-" + MM + "-" + dd + " " + hh + ":" + mm + ":" + ss + "&nbsp;&nbsp;&nbsp;" + day;
                 setTimeout('startTime()', 1000); //每一秒中重新加載startTime()方法 
             }

             function checkTime(i) {
                 if (i < 10) {
                     i = "0" + i;
                 }
                 return i;
             }  
         </script>
     </head>
     <body onload="startTime()">
         OS TIME：<font color="blue"><span id="nowDateTimeSpan"></span></font>    
     </body>
 </html>