moment.js makes it easy to get the week of the current year in the current date_javascript skills

/**
* * Realize that the current date is the first week of the year, and then push forward and backward by a few weeks
* The js array stores the two weeks before and after the current date (a total of five weeks of data)
**/
var initSearchMajorChanges = function(){
//Realize that the current date is the first week of the year, and then push forward and backward by a few weeks. The js array saves the two weeks before and after the current date (a total of five weeks of data)
      var vv='2015-02-07';
      var vNowDate=moment(new moment(vv).format("YYYY-MM-DD"));//.add('month',0).add('days',-1);
        var vWeekOfDay=moment(vNowDate).format("E");//Calculate the day of the week
      var vWeekOfDays=7-vWeekOfDay-1;
      var vStartDate=moment(vNowDate).add('days',vWeekOfDays);
      var vEndDate=moment(vNowDate).add('days',-vWeekOfDay);
      var vStartDateNew=moment(vStartDate).add('days',7*$scope.gWeeks);
        var vEndDateNew=moment(vEndDate).add('days',-(7*$scope.gWeeks));
//var vYearAndWeek=moment(vStartDate).format("YYYY") '-' moment(vStartDate).format("WW");
searchMajorChanges(vStartDateNew,vEndDateNew);
}