在config.php 同级的tags.php中的【app_init】添加：
"app\api\behavior\CORS" 例下图：
然后在 app/behavior下新建文件：CORS.php，文件路径例下图：
CORS.php文件内容：
<?php
namespace app\api\behavior;
use think\Response;
class CORS {
public function appInit(){
if (request()->isOptions()) {
header('Access-Control-Allow-Origin:*');
header('Access-Control-Allow-Headers:Accept,Referer,Host,Keep-Alive,User-Agent,X-Requested-With,Cache-Control,Content-Type,Cookie,token');
header('Access-Control-Allow-Credentials:true');
header('Access-Control-Allow-Methods:GET,POST,OPTIONS,PUT,DELETE');
header('Access-Control-Max-Age:1728000');
header('Content-Type:text/plain charset=UTF-8');
header('Content-Length: 0', true);
header('status: 204');
header('HTTP/1.0 204 No Content');
}else{
header('Access-Control-Allow-Origin:*');
header('Access-Control-Allow-Headers:Accept,Referer,Host,Keep-Alive,User-Agent,X-Requested-With,Cache-Control,Content-Type,Cookie,token');
header('Access-Control-Allow-Credentials:true');
header('Access-Control-Allow-Methods:GET,POST,OPTIONS');
}
}
}
