create-react-app 按需加载以及部署

闲来无事,就想着把前几天折腾的问题重新梳理一遍,加深印象.
上面一篇文章有提到升级eject的cra项目.为什么升级这个项目,就是想要折腾,就是想要使用到webpack2,还有一个好处是加深对create-react-app的理解.坏处不言而喻,折腾浪费生命浪费时间.

按需加载

• AsyncComponent.js

import React, { Component } from "react";

export default function asyncComponent(importComponent) {
    class AsyncComponent extends Component {
        constructor(props) {
            super(props);

            this.state = {
                component: null
            };
        }

        async componentDidMount() {
            const { default: component } = await importComponent();

            this.setState({
                component: component
            });
        }

        render() {
            const Component = this.state.component;

            return Component ?  : null;
        }
    }

    return AsyncComponent;
}

这个是异步加载组件的方法.到时在需要的组件上加入引用就好.例如在路由里.

• Menu.js

const AsyncUser = asyncComponent(() => import("./User"));
...

部署(nginx以及npm2)

• nginx

  • 准备工作

      npm run build
  

  • sudo vim /etc/nginx/sites-enabled/react-app.conf

     server {
         listen 7878;
         server_name 127.0.0.1;
         root /home/deploy/workspace/project/build;
         location / {
             try_files $uri /index.html;
             add_header   Cache-Control no-cache;
             #expires      1d;
         }
     }
  

  • 启用nginx配置

      sudo service nginx reload
      sudo service nginx restart
  

  • 注意
    如果是阿里云服务器,可能访问失败,阿里云的安全策略默认是只开启了80端口,首先去实例里检测其他的端口是否开放.

• pm2

  • installl and start

        sudo npm install pm2 -g
        pm2 start npm -- start
    

  • nginx

      # sudo vim /etc/nginx/sites-available/react-app.conf
      server{
            listen 80 default_server;
            server_name YOUR-SERVER-NAME;
            location / {
              proxy_pass http://localhost:3000; #or any port number here
              proxy_http_version 1.1;
              proxy_set_header Upgrade $http_upgrade;
              proxy_set_header Connection 'upgrade';
              proxy_set_header Host $host;
              proxy_cache_bypass $http_upgrade;
            }
      }
    

  • restart

     sudo service nginx reload
     sudo service nginx restart
    

参考

• Code Splitting 参考