如何在wordpress管理员端主题选项中添加select2 js

function enqueue_select2_scripts() {
    wp_enqueue_style( 'select2-css', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css' );
    wp_enqueue_script( 'select2-js', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js', array( 'jquery' ), '4.0.13', true );
}
add_action( 'admin_enqueue_scripts', 'enqueue_select2_scripts' );

function add_select2_field() {
    ?>
    <select class="select2" name="select2_field">
        <option value="option1">Option 1</option>
        <option value="option2">Option 2</option>
        <option value="option3">Option 3</option>
    </select>
    <script>
        jQuery(document).ready(function($) {
            $('.select2').select2();
        });
    </script>
    <?php
}
add_action( 'admin_init', 'add_select2_field' );