如何将jQuery UI所有选定范围(不仅是最小值和最大值)加载到数组

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="https://code.jquery.com/ui/1.13.1/jquery-ui.min.js"></script>

<div id="selectable">
  <div class="ui-widget-content">Item 1</div>
  <div class="ui-widget-content">Item 2</div>
  <div class="ui-widget-content">Item 3</div>
  <div class="ui-widget-content">Item 4</div>
  <div class="ui-widget-content">Item 5</div>
</div>

$("#selectable").selectable();

var selectedItems = [];

$("#selectable").on("selected", function(event, ui) {
  var selectedElements = $(ui.selected).toArray();
  selectedItems = selectedItems.concat(selectedElements);
});