在使用axios时，经常会遇到跨域问题。为了解决跨域问题，可以在 vue.config.js 文件中配置代理：

const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
  transpileDependencies: true,
  devServer: {
    port: 7070,
    proxy: {
      '/api': {
        target: 'http://localhost:8080/admin',
        pathRewrite: {
          '^/api': ''
        }
      }
    }
  }
})

axios的post请求示例：

axios.post('/api/employee/login',{
      username:'admin',
      password: '123456'
    }).then(res => {
      console.log(res.data)
    }).catch(error => {
      console.log(error.response)
    })

前端发送：http://localhost:7070/api/employee/login
经过代理转换为：http://localhost:8080/admin/employee/login

axios的get请求示例：

axios.get('/api/shop/status',{
        headers: {
          token: ‘xxx.yyy.zzz’
        }
      })

前端发送：http://localhost:7070/api/shop/status
经过代理转换为：http://localhost:8080/admin/shop/status

打包部署vue

npm run build

打包结束后生成dist文件夹

注意：打包时这个代理并不会跟着打包

假设我们将项目打包到的nginx地址是localhost地址，访问端口是80（80默认可省略）

那么这时候数据请求将请求的是http://localhost/api/employee/login地址，但是我们需要请求的接口是localhost:8080地址，这时候就需要用到nginx的反向代理了 。

首先进入配置文件

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
	
	map $http_upgrade $connection_upgrade{
		default upgrade;
		'' close;
	}

	upstream webservers{
	  server 127.0.0.1:8080 weight=90 ;
	  #server 127.0.0.1:8088 weight=10 ;
	}

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html/sky;
            index  index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # 反向代理,处理管理端发送的请求
        location /api/ {
			proxy_pass   http://localhost:8080/admin/;
            #proxy_pass   http://webservers/admin/;
        }
		
		# 反向代理,处理用户端发送的请求
        location /user/ {
            proxy_pass   http://webservers/user/;
        }
		
		# WebSocket
		location /ws/ {
            proxy_pass   http://webservers/ws/;
			proxy_http_version 1.1;
			proxy_read_timeout 3600s;
			proxy_set_header Upgrade $http_upgrade;
			proxy_set_header Connection "$connection_upgrade";
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

配置好了代理之后就可以重启服务器了
nginx将http://localhost/api/employee/login 转为http://localhost:8080/admin/employee/login