1.模块下创建文件夹behavior，并创建CORS.php文件，内容如下
<?php
namespace app\api\behavior;
use think\Response;
class CORS
{
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,PATCH');
if (request()->isOptions()) {
exit();
}
}
}