这是因为您没有排除ajax请求。

检查以下示例the WordPress Codex for the admin_init hook 也适用于init 钩住并查看AJAX请求如何排除在if 使用DOING_AJAX 常数：

/**
 * Restrict access to the administration screens.
 *
 * Only administrators will be allowed to access the admin screens,
 * all other users will be shown a message instead.
 *
 * We do allow access for Ajax requests though, since these may be
 * initiated from the front end of the site by non-admin users.
 */
function restrict_admin() {

    if ( ! current_user_can( \'manage_options\' ) && ( ! defined( \'DOING_AJAX\' ) || ! DOING_AJAX ) ) {
        wp_die( __( \'You are not allowed to access this part of the site\' ) );
    }
}
add_action( \'admin_init\', \'restrict_admin\', 1 );

add_action( \'init\', \'wpse_182220_init\' );
function wpse_182220_init() {

    // Exit function if doing an AJAX request
    if ( defined( \'DOING_AJAX\' ) && DOING_AJAX ) {
        return;
    }

    echo \'OK, not doing AJAX\';

}