tp6 解决设置跨域不生效问题

在middleware文件夹下创建AllowCrossDomain.php

<?php
declare (strict_types=1);

namespace app\api\middleware;

use Closure;
use think\Request;
use think\Response;
use think\facade\Config;

/**
 * 跨域请求支持
 * 安全起见，只支持了配置中的域名
 */
class AllowCrossDomain
{
    protected $header = [
        'Access-Control-Allow-Credentials' => 'true',
        'Access-Control-Max-Age'           => 1800,
        'Access-Control-Allow-Methods'     => 'GET, POST, PATCH, PUT, DELETE, OPTIONS',
        'Access-Control-Allow-Headers'     => 'think-lang, server, ba-user-token, batoken, Authorization, Content-Type, If-Match, If-Modified-Since, If-None-Match, If-Unmodified-Since, X-CSRF-TOKEN, X-Requested-With',
    ];

    /**
     * 跨域请求检测
     * @access public
     * @param Request    $request
     * @param Closure    $next
     * @param array|null $header
     * @return Response
     */
    public function handle(Request $request, Closure $next, ?array $header = []): Response
    {
        $header = !empty($header) ? array_merge($this->header, $header) : $this->header;

        $origin = $request->header('origin');
        if ($origin) {
            $info = parse_url($origin);

            // 获取跨域配置
            $corsDomain   = explode(',', Config::get('matter.cors_request_domain'));
            $corsDomain[] = $request->host(true);

            if (in_array("*", $corsDomain) || in_array($origin, $corsDomain) || (isset($info['host']) && in_array($info['host'], $corsDomain))) {
                header("Access-Control-Allow-Origin: " . $origin);
            }
        }

        return $next($request)->header($header);
    }
}

在middleware.php中引入

<?php
return [
    \app\api\middleware\AllowCrossDomain::class,
];

如不生效,可不使用上述方法，直接去修改入口文件
在入口文件public/index.php中添加options请求的处理

// 处理 OPTIONS 请求
if($_SERVER['REQUEST_METHOD'] == 'OPTIONS'){
    header("'Access-Control-Allow-Credentials: true");
    header("Access-Control-Allow-Origin: *");
    header("Access-Control-Allow-Headers: Token, Authorization, Content-Type, If-Match, If-Modified-Since, If-None-Match, If-Unmodified-Since, X-CSRF-TOKEN, X-Requested-With, X-Token");
    header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS, PATCH');
    exit; // 直接退出，不走后序流程
}