终于解决了困扰了两天的问题：

需求：

基于vue3的前端项目以及基于laravel的后端项目。将他们分别配置为127.0.0.1 www.ggzx.com  以及 127.0.0.1 www.zx.com。

再在nginx上配置相应的项目，如下：

前端项目：

 后端项目：

 问题：

由于两个项目的前后端是不同的源，因此在浏览器中会有跨域的问题。

解决办法需要两个步骤：①服务端需要在Nginx配置中为你的代理服务添加正确的CORS头部设置 ②服务器设置中间件允许固定的访问源进行访问

如下：

server {
    listen 8000;
    server_name www.zx.com;

    root /Users/hoge/Desktop/code/php/zxAdmin/public;
    index index.php index.html index.htm;

    # 处理 API 路由的 CORS 配置
  
    location / {
        proxy_pass http://www.ggzx.com;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
 
        # 添加CORS头部
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization,token';
        
        # 预检请求响应，nginx会发送两个请求，其中先发送预处理请求，当允许访问的时候再发送真正的请求
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization,token';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain charset=UTF-8';
            add_header 'Content-Length' 0;
            return 204;
        }
        try_files $uri $uri/ /index.php?$query_string;
    }

    # 处理 PHP 文件
    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }

    # 禁止访问 .ht 文件
    location ~ /\.ht {
        deny all;
    }

    # 静态文件缓存
    location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
        expires max;
        log_not_found off;
    }

}

②设置中间件文件

<?php
namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

class HandleCors
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure(\Illuminate\Http\Request): (\Illuminate\Http\Response|\Illuminate\Http\RedirectResponse)  $next
     * @return \Illuminate\Http\Response|\Illuminate\Http\RedirectResponse
     */
    public function handle(Request $request, Closure $next)
    {
        $response = $next($request);
        // 设置跨域
        $response->headers->set('Access-Control-Allow-Origin', '*');
        $response->headers->set('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
        $response->headers->set('Access-Control-Allow-Headers', 'Content-Type, Accept, Authorization, X-Requested-With, Origin, X-CSRF-Token');
 
        return $response;
    }
}

在接口调用前使用中间建