日期选择时两个日期之间的动态控制--My97datepicker日期选择控件

实现效果：如果先选离店日期，再选入住日期的话，入住日期大于离店日期则离店日期+1天否则离店日期不变，先选入店再选离店离店，离店只能选之后的日期，且两个日期之间最多间隔88天

<div class="searchbook-nape">入住日期：</div>
<div class="searchbook-nav">
        <input type="text" class="searchbook-ipt validate[required]" id="CheckInDate" name="CheckInDate"/>
</div>

<div class="searchbook-nape">离店日期：</div>
<div class="searchbook-nav">
         <input type="text" class="searchbook-ipt validate[required]" id="CheckOutDate" name="CheckOutDate"/>
</div>

$("[name=CheckInDate]")
            .focus(
            function () {
                pickCheckInDate();
            });
        $("[name=CheckInDate]")
            .click(
            function () {
                if ($("[name=CheckInDate]").is(":focus")) {
                    pickCheckInDate();
                }
            });
        function pickCheckInDate() {
            var minDate = new Date();
            var maxDate = new Date();
            maxDate.setDate(maxDate.getDate() + 88);
            WdatePicker({
                skin: 'default',
                doubleCalendar: true,
                dateFmt: 'yyyy-MM-dd',
                minDate: minDate.format('yyyy-MM-dd'),
                maxDate: maxDate.format('yyyy-MM-dd'),
                onpicked: function () {
                    var checkOutDate = $('[name=CheckOutDate]').val();
                    if (checkOutDate) {
                        var min = new Date(checkOutDate);
                        min.setDate(min.getDate() - 28);
                        var checkInDate = $('[name=CheckInDate]').val();
                        var date = new Date(checkInDate);
                        var max = new Date(checkOutDate);
                        if (date < min || date >= max) {
                            date.setDate(date.getDate() + 1);
                            $('[name=CheckOutDate]').val(date.format('yyyy-MM-dd'));
                        }
                    }
                }
            });
        }
        $("[name=CheckOutDate]")
            .focus(
            function () {
                pickCheckOutDate();
            });
        $("[name=CheckOutDate]")
            .click(
            function () {
                if ($("[name=CheckOutDate]").is(":focus")) {
                    pickCheckOutDate();
                }
            });
        function pickCheckOutDate() {
            var minDate;
            var maxDate = new Date();
            maxDate.setDate(maxDate.getDate() + 89);
            if ($("[name=CheckInDate]").val()) {
                var checkInDate = $('[name=CheckInDate]').val();
                minDate = new Date(checkInDate);
                var maxDate28 = new Date(checkInDate);
                maxDate28.setDate(maxDate28.getDate() + 28);
                if (maxDate28 < maxDate) {
                    maxDate = maxDate28;
                }
            } else {
                minDate = new Date();
            }
            minDate.setDate(minDate.getDate() + 1);
            WdatePicker({
                skin: "default",
                doubleCalendar: true,
                dateFmt: "yyyy-MM-dd",
                minDate: minDate.format("yyyy-MM-dd"),
                maxDate: maxDate.format("yyyy-MM-dd")
            });
        }