php代码进行跨域请求处理

以下的函数作为每个请求的前置操作 (thinkphp框架)
public function appInit(&$params)
{
header('Access-Control-Allow-Origin: *');
header("Access-Control-Allow-Headers: token,Origin, X-Requested-With, Content-Type, Accept");
header('Access-Control-Allow-Methods: POST,GET');
if(request()->isOptions()){
exit();
}
}