利用Date對象編寫程序，判斷并輸出今天是開學的第幾周，星期幾。

(function(){

var startDay = new Date(2014,8,1);?? ??? ?//根據指定的年月日時分秒設置開學時間為2014/09/01

var startMs = startDay.getTime();//返回1970年至今的毫秒

var startYear = startDay.getFullYear();//從Date對象以四位數字返回年份

var startMonth = startDay.getMonth()+1;?? ?//從Date對象返回年份(0-11)

var startDate = startDay.getDate();?? ??? ?// 從Date對象返回一月中的某一天(1~31)

var nowDay = new Date();

var nowMs = nowDay.getTime();

var nowYear = nowDay.getFullYear();

var nowMonth = nowDay.getMonth()+1;

var nowDate = nowDay.getDate();

var startDays = parseInt(startMs/86400000);

var nowDays = parseInt(nowMs/86400000);

var totalDays = nowDays - startDays;

var week = parseInt(totalDays/7)+1;

var nowdate = nowDay.getDay();

msg1 = "開學時間：" + startYear + " 年 " + startMonth + " 月 " + startDate + "日";

document.write(msg1);

document.write("
")

msg2 ="現在時間：" + nowYear + " 年 " + nowMonth + " 月 " + nowDate + "日";

document.write(msg2);

document.write("
");

msg3 =? "第" + week + "周，星期" + nowdate;

document.write(msg3);

})();

總結

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