获取某日期是在一年中第几周

1. function getWeekOfYear(theDate) {
   
2.         var a = new Date(theDate.getFullYear(), theDate.getMonth(), theDate.getDate());
   
3.         var b = new Date(theDate.getFullYear(), 0, 1);
   
4.         var d = (a.getTime() - b.getTime()) / 86400000;
   
5.         var w = Math.floor(d / 7) + 1;
   
6.         if (7-b.getDay() < d % 7) {
   
7.                 w++;
   
8.         }
   
9.         return w;
   
10. }
    
11. 
    
12. alert( getWeekOfYear( new Date() ) );

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可恶还要字数限制