nginx的配置： 

 把 /api 转到 另一个域名下

#PROXY-START/api
location /api
{
    expires 12h;
    if ($request_uri ~* "(php|jsp|cgi|asp|aspx)")
    {
         expires 0;
    }
    proxy_pass https://www.c3w.com.cn;
    proxy_set_header Host https://www.c3w.com.cn;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header REMOTE-HOST $remote_addr;
    
    #持久化连接相关配置
    #proxy_connect_timeout 30s;
    #proxy_read_timeout 86400s;
    #proxy_send_timeout 30s;
    #proxy_http_version 1.1;
    #proxy_set_header Upgrade $http_upgrade;
    #proxy_set_header Connection "upgrade";

    add_header X-Cache $upstream_cache_status;
    
    
}

#PROXY-END/api

VUE的配置：

// 代理跨域
    proxyTable: {
      "/api": {
        target: "https://www.c3w.cc/api",// 前端的域名
        secure: true,  //如果是https接口，需要配置这个参数
        changeOrigin: true, //如果接口跨域，需要进行这个参数配置
        pathRewrite: {
          "^/api" : ""
          }
      }
    },