问限制日期选择器中的拾取日期

EN

window.onload = function() {
  if (window.jQuery) {
    let $ = window.jQuery;
    let today = new Date();
    let next_week = today.getTime() + 7 * 24 * 60 * 60 * 1000;

    $(function() {
      $("#date").datepicker({
        beforeShowDay: function(date) {
            var day_of_week = date.getDay();
         
            //disable all dates in the past, disable all days of the week after today's day of the week but within 7 days
            if (date.getTime() <= today.getTime() || (day_of_week > today.getDay() && date.getTime() < next_week)) {
                return [false, ""];
            }
            
            //disable all sundays
            return [(day_of_week != 0), ""];
        }
      });
    });
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.9.2/jquery-ui.min.js"></script>
<link href="//code.jquery.com/ui/1.9.2/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" media="all">
<div style="width:300px; clear:both;">
    <p>
      <label for="date">Pick a delivery date:</label>
      <input id="date" type="text" name="attributes[date]" value="{{ cart.attributes.date }}" />
      <span style="display:block" class="instructions"> We do not deliver on Sundays.</span>
    </p>
</div>