1.页面加载显示当前年份的第几周

效果如图：

html代码：

<font size="2" color="black">
     <input id="btnweek5" type="button" class="btn" value="上周" οnclick="EduCommission.GetLastWeek()" />
      <span id="year"></span><span>第</span><span id="week"></span><span>周</span>
      <input id="btnweek6" type="button" value="下周" class="btn" οnclick="EduCommission.GetNextWeek()" />
  </font>

JS代码：

var date = new Date();
    nowyear = date.getFullYear();
    nowweek = EduCommission.TheWeek(date);
    $("#year").text(nowyear);
    $("#week").text(nowweek - 1);

//本周 EduCommission.TheWeek = function (now) {

var totalDays = 0;

var years = now.getYear();

if (years < 1000)

years += 1900;

var days = new Array(12);

days[0] = 31;

days[2] = 31;

days[3] = 30;

days[4] = 31;

days[5] = 30;

days[6] = 31;

days[7] = 31;

days[8] = 30;

days[9] = 31;

days[10] = 30;

days[11] = 31;

if (Math.round(now.getYear() / 4) == now.getYear() / 4)

{  days[1] = 29;     }

else { days[1] = 28;}

if (now.getMonth() == 0)

{

totalDays = totalDays + now.getDate();

}

else {

var curMonth = now.getMonth();

for (var count = 1; count <= curMonth; count++) {

totalDays = totalDays + days[count - 1];         }

totalDays = totalDays + now.getDate();     }

var week = Math.round(totalDays / 7) + 1;

return week; }

 2.点击上一周或下一周时：

//点击上一周

EduCommission.GetLastWeek = function () {

var y = $("#year").text();

var week = $("#week").text();

if (week == 1) {

$("#year").text(y - 1);

var strdate = y - 1 + "-12-31";

var date = new Date(Date.parse(strdate.replace(/-/g, "/")));

var lastyearweek = EduCommission.TheWeek(date);

$("#week").text(lastyearweek);     }

else {

$("#week").text(week - 1);

}  }；

//点击下一周

EduCommission.GetNextWeek = function () {

var y = $("#year").text();

var week = $("#week").text();

if (y < nowyear) {

var strdate = y + "-12-31";

var date = new Date(Date.parse(strdate.replace(/-/g, "/")));

var weekcount = EduCommission.TheWeek(date);

if (week == weekcount) {

$("#year").text(parseInt(y) + 1);

$("#week").text(1);

}

else {

$("#week").text(parseInt(week) + 1);

}

else {

$("#week").text(parseInt(week) + 1);

}

}；