moment.js轻松实现获取当前日期是当年的第几周

/**

     * 实现当前日期是当年的第几周,再向前和向后推几周

     * js数组保存当前日期的前后两周(共五周的数据)

     * */

    var initSearchMajorChanges = function(){

        //实现当前日期是当年的第几周,再向前和向后推几周,js数组保存当前日期的前后两周(共五周的数据)

        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");//算出这周的周几

        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);

    }