1 function theWeek(now) {
2 var totalDays = 0;
3 years = now.getYear()
4 if (years < 1000)
5 years += 1900
6 var days = new Array(12);
7 days[0] = 31;
8 days[2] = 31;
9 days[3] = 30;
10 days[4] = 31;
11 days[5] = 30;
12 days[6] = 31;
13 days[7] = 31;
14 days[8] = 30;
15 days[9] = 31;
16 days[10] = 30;
17 days[11] = 31;
18
19 //判断是否为闰年，针对2月的天数进行计算
20 if (Math.round(now.getYear() / 4) == now.getYear() / 4) {
21 days[1] = 29
22 } else {
23 days[1] = 28
24 }
25
26 if (now.getMonth() == 0) {
27 totalDays = totalDays + now.getDate();
28 } else {
29 var curMonth = now.getMonth();
30 for (var count = 1; count <= curMonth; count++) {
31 totalDays = totalDays + days[count - 1];
32 }
33 totalDays = totalDays + now.getDate();
34 }
35 //得到第几周
36 var week = Math.round(totalDays / 7);
37 return week;
38 }
