您需要加载一些wp管理样式。

因为我找不到任何方法让wp\\u enqueue\\u style（）接受url参数，所以我在这里通过wp\\u head hook函数加载样式。

add_action( \'wp_head\', \'load_admin_media_styles\', 10);
function load_admin_media_styles(){
    // list all style libs the post page of wp-admin loaded, but we may only need to load 2 of them
    $ary_libs = array(
        \'common\',\'forms\',
        // \'dashicons\', \'admin-bar\',\'buttons\',\'media-views\',
        // \'admin-menu\',\'dashboard\',\'list-tables\',\'edit\',\'revisions\',\'media\',\'themes\',\'about\',\'nav-menu\',
        // \'s\',\'wp-pointer\',\'widgets\',\'site-icon\',\'l10n\',\'wp-auth-check\',\'wp-color-picker\'
    );
    $admin_media_styles_url = add_query_arg(
        array(
            \'c\' => 0,
            \'dir\' => \'ltr\',
            \'load[]\' => implode(\',\', $ary_libs),
            \'ver\' => \'you_wp_version\'
        ),
        admin_url().\'load-styles.php\'
    );
    echo "<link rel=\'stylesheet\' id=\'admin_styles_for_media-css\' href=\'".$admin_media_styles_url."\' type=\'text/css\' media=\'all\' />";
}