如何使用jQuery日期选择器禁用每月最后3天

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>

<input type="text" id="datepicker">

$(function() {
  $("#datepicker").datepicker({
    beforeShowDay: function(date) {
      var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0).getDate();
      if (date.getDate() > lastDay - 3) {
        return [false];
      }
      return [true];
    }
  });
});