function startTime() {                      var today = new Date(); //定义日期对象                        var yyyy = today.getFullYear(); //通过日期对象的getFullYear()方法返回年                         var MM = today.getMonth() + 1; //通过日期对象的getMonth()方法返回年                         var dd = today.getDate(); //通过日期对象的getDate()方法返回年                          var hh = today.getHours(); //通过日期对象的getHours方法返回小时                        var mm = today.getMinutes(); //通过日期对象的getMinutes方法返回分钟                        var ss = today.getSeconds(); //通过日期对象的getSeconds方法返回秒                        // 如果分钟或小时的值小于10，则在其值前加0，比如如果时间是下午3点20分9秒的话，则显示15：20：09                        MM = checkTime(MM);                      dd = checkTime(dd);                      mm = checkTime(mm);                      ss = checkTime(ss);                      var day; //用于保存星期（getDay()方法得到星期编号）                      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 + "   " + day;                      setTimeout('startTime()', 1000); //每一秒中重新加载startTime()方法                  }                  function checkTime(i) {                      if (i < 10) {                          i = "0" + i;                      }                      return i;                  }