js一周时间表

　　　　<div class="datetext">
               <img class="dateLeft" src="./images/dateLeft.png">
               <div><span class="startDate">2019-07-08</span> 至 <span class="endDate">2019-07-14</span></div>
               <img class="dateRight" bindtap="nextWeek" src="./images/dateRight.png">
       </div>

// 一周时间表
            function getBeforeDate(n) {//n为你要传入的参数，当前为0，前一天为-1，后一天为1
                var date = new Date();
                var year, month, day;
                date.setDate(date.getDate() + n);
                year = date.getFullYear();
                month = date.getMonth() + 1;
                day = date.getDate();
                s = year + '-' + (month < 10 ? ('0' + month) : month) + '-' + (day < 10 ? ('0' + day) : day);
                return s;
            }

            getBeforeDate(0);

            function addDate(date, days) {
                var d = new Date(date);
                d.setDate(d.getDate() + days);
                var month = d.getMonth() + 1;
                var day = d.getDate();
                if (month < 10) {
                    month = "0" + month;
                }
                if (day < 10) {
                    day = "0" + day;
                }
                var val = d.getFullYear() + "-" + month + "-" + day;
                return val;
            }

            var nowDate = new Date();
            //当前日
            var nowDay = nowDate.getDate();
            //今天是本周的第几天
            var nowDayOfWeek = nowDate.getDay();
            // console.log(nowDayOfWeek)
            // console.log(getBeforeDate(1 - nowDayOfWeek));
            // 获取当前一周时间表
            $('.startDate').html(getBeforeDate(1 - nowDayOfWeek));
            $('.endDate').html(getBeforeDate(1 - nowDayOfWeek + 6));
            // 点击上一周
            $('.dateLeft').on('click', function () {
                let dateStart = addDate($('.startDate').html(), -7);
                let dateEnd = addDate($('.endDate').html(), -7);
                $('.startDate').html(dateStart);
                $('.endDate').html(dateEnd);
            })
            // 点击下一周
            $('.dateRight').on('click', function () {
                let dateStart = addDate($('.startDate').html(), 7);
                let dateEnd = addDate($('.endDate').html(), 7);
                $('.startDate').html(dateStart);
                $('.endDate').html(dateEnd);
            })

.datetext {
            padding: 0 0.4267rem;
            height: 1.3067rem;
            display: flex;
            align-items: center;
            background: #fff;
            margin-top: 0.0133rem;
        }

        .datetext>img {
            width: 0.6667rem;
            height: 0.6667rem;
        }

        .datetext>div {
            flex: 1;
            text-align: center;
            color: #333;
            font-size: 0.4533rem;
        }