在页面加载时，如果下拉列表中只有一个选项，则在jquery select2中自动选择该选项，而无需单击它

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0/dist/js/select2.min.js"></script>

$(document).ready(function() {
  $("#your-select-element").select2();
});

$(document).ready(function() {
  $("#your-select-element").select2();

  var optionCount = $("#your-select-element option").length;
  if (optionCount === 1) {
    $("#your-select-element").val($("#your-select-element option:first").val()).trigger("change");
  }
});

$(document).ready(function() {
  $("#your-select-element").select2();

  var optionCount = $("#your-select-element option").length;
  if (optionCount === 1) {
    $("#your-select-element").val($("#your-select-element option:first").val()).trigger("change");
    $("#your-select-element").select2("val", $("#your-select-element").val());
  }
});