将以下代码插入到functions.php文件中即可

add_filter("json_enabled", "__return_false");
add_filter("json_jsonp_enabled", "__return_false");
add_filter("rest_enabled", "__return_false");
add_filter("rest_jsonp_enabled", "__return_false");
remove_action("init", "rest_api_init");
remove_action("rest_api_init", "rest_api_default_filters", 10);
remove_action("parse_request", "rest_api_loaded");
remove_action("wp_head", "rest_output_link_wp_head", 10);
remove_action("template_redirect", "rest_output_link_header", 11);
remove_action("auth_cookie_malformed", "rest_cookie_collect_status");
remove_action("auth_cookie_expired", "rest_cookie_collect_status");
remove_action("auth_cookie_bad_username", "rest_cookie_collect_status");
remove_action("auth_cookie_bad_hash", "rest_cookie_collect_status");
remove_action("auth_cookie_valid", "rest_cookie_collect_status");
 
add_filter("rest_authentication_errors", function () {
    return new WP_Error("rest_disabled", __("The REST API on this site has been disabled."), ["status" => rest_authorization_required_code()]);
});

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