登錄依賴cookie，且cookie是跨域不共享的，如果是前后臺分離開發(fā)，肯定存在跨域的情況，有時需要在服務(wù)器上同時啟動前后臺服務(wù)，然后使用nginx服務(wù)器配置反向代理來解決前后臺跨域問題
參考：https://www.runoob.com/linux/nginx-install-setup.html

步驟

1. 下載：https://nginx.org/en/download.html （下載速度很快，壓縮包）
2. 解壓到指定位置，比如C盤根目錄，并重命名為nginx
3. 使用vscode打開 windows:C:\nginx\conf\nginx.conf

• 參數(shù)：
  worker_processes 1; （cpu是幾核的，負(fù)載均衡）
  listen 9090; （監(jiān)聽端口）
  proxy_pass http://localhost:9001; （前臺服務(wù)端口）
  proxy_pass http://localhost:9000; （后臺服務(wù)端口）
• 可以做多服務(wù)跨域處理

#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;

    server {
        listen       9090;
        server_name  localhost;
        location / {
            proxy_pass http://localhost:9001;
        }
        location /dev-api/ {
            proxy_pass http://localhost:9000;
            proxy_set_header Host $host;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }

    server {
        listen       3030;
        server_name  localhost;
        location / {
            proxy_pass http://localhost:3001;
        }
        location /api/ {
            proxy_pass http://localhost:3000;
            proxy_set_header Host $host;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }


    # 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;
    #    }
    #}

}

4. 保存測試
   用vscode或者win+R cmd 打開windows:C:\nginx
   輸入：start nginx
   然后：nginx -t 檢測是否成功啟動，出現(xiàn)以下字樣，代表nginx啟動成功
   nginx: the configuration file C:\nginx/conf/nginx.conf syntax is ok
   nginx: configuration file C:\nginx/conf/nginx.conf test is successful
5. 跨域測試
   瀏覽器輸入：http://localhost:9090/index.html （此端口是監(jiān)聽端口，非前后端服務(wù)端口）
   打開頁面后，前端服務(wù)可以正常訪問接口，證明nginx跨域代理成功
6. nginx 常用命令
   啟動：start nginx 或者 nginx
   重啟：nginx -s reload
   停止：nginx -s stop
   檢測是否成功：nginx -t