因为无论如何我都将所有内容转发到index.php，所以我想我会尝试在PHP中设置标头，而不是.htaccess文件，并且它起作用了！好极了！这是我添加到index.php中的其他有此问题的人的内容。
// Allow from any originif (isset($_SERVER['HTTP_ORIGIN'])) { // should do a check here to match $_SERVER['HTTP_ORIGIN'] to a // whitelist of safe domains header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}"); header('Access-Control-Allow-Credentials: true'); header('Access-Control-Max-Age: 86400'); // cache for 1 day}// Access-Control headers are received during OPTIONS requestsif ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') { if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD'])) header("Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS"); if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS'])) header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");}因为我使用的是Slim，所以我添加了此路由，以便OPTIONS请求获得HTTP 200响应
// return HTTP 200 for HTTP OPTIONS requests$app->map('/:x+', function($x) { http_response_pre(200);})->via('OPTIONS');
