var TC = 0;
function TimeWatch() {
   if (TC < 1200) {    //10分鐘後停止執行
        TC++ ;        //10分鐘後停止執行
    var time = new Date();
    var hour = time.getHours();
    var min = time.getMinutes();
    var sec = time.getSeconds();
        if (hour < 10) {    //時、分、秒的值若為個位數，則在其前面加0
            hour = "0" + hour;
                        }
        if (min < 10) { 
            min = "0" + min; 
                       }
        if (sec < 10) {
            sec = "0" + sec;
                       } 
    document.Watch2.watch2.value = hour+':'+min+':'+sec;
    setTimeout("TimeWatch()", 500);
                 }     //10分鐘後停止執行
}