Thiết lập giá trị mặc định ban đầu trên HTML như bình thường (ok)

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <link href="https://cdn.jsdelivr.net/npm/select2@4.0.13/dist/css/select2.min.css" rel="stylesheet" />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/select2@4.0.13/dist/js/select2.min.js"></script>
</head>

<body>
  <select class="js-example-basic-single" name="state">
    <option value="">--Select--</option>
    <option  selected="selected" value="AL">Alabama</option>
    <option value="WY">Wyoming</option>
  </select>
  <script>
  $(document).ready(function() {
    ajax: {
      url: "/contacts",
      dataType: "json",
      delay: 200,
      data: function(params) {
        return {
          search: params.term
        };
      },
      processResults: function(data) {
        return {
          results: data
        };
      },
      cache: true
    }
  });
  </script>
</body>

</html>

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