function getStartDateByWeek(year, week) {
            var startDate = new Date();
            startDate.setFullYear(year, 0, 1); //变态的js月份从0开始
            var dayOfWeek = startDate.getDay();
            var count = 0;
            var weekCount = 1;
            if (weekCount === week) {
                return startDate;
            }
            else {
                while (weekCount !== week) {
                    startDate.setDate(startDate.getDate() + 7);
                    weekCount++;
                }
                while (dayOfWeek > 0) {
                    startDate.setDate(startDate.getDate() - 1);
                    dayOfWeek = startDate.getDay();
                }
            }
            return startDate;
        }