First experience of Qiankun micro front end

JavaScript Art 2021-06-17 19:24:16
experience qiankun micro end

What is a micro front end

In plain English , Micro front end can deploy different parts of a large application independently , The parts are independent of each other , The ability to deploy independently allows them to build isolated or loosely coupled services . That is, the single page front-end application is transformed from a single single single application into a multi small front-end application .

The core design concept of micro front end

  • Technology stack independent The main framework does not limit access to the application technology stack , Micro applications have full autonomy
  • Independent development 、 Independent deployment The micro application warehouse is independent , The front and rear end can be developed independently , After the deployment, the main framework automatically completes the synchronization update
  • Incremental upgrade In the face of all kinds of complex scenes , It is usually difficult for us to upgrade or refactor an existing system , And micro front end is a very good means and strategy to implement gradual reconfiguration
  • When running independently State isolation between each micro application , Runtime state not shared

The core goal of the micro front end is to split the giant application into several independent sub applications

qiankun It's based on single-spa Micro front end implementation library of

qiankun Quick start

qiankun Official website Specific code examples github There are some qiankun Example code for

Main application

The main application is not limited to technology stack , Just provide a container DOM, Then register the micro app and start that will do .

yarn add qiankun # perhaps npm i qiankun -S
import { registerMicroApps, start } from 'qiankun'; /** * Register the micro application in the main application */ registerMicroApps([ { name: 'vue sub-app1', entry: '//localhost:7100/sub.html', container: '#yourContainer', activeRule: '/yourActiveRule', }, { name: 'vue sub-app2', entry: '//localhost:7101', container: '#yourContainer', activeRule: '/yourActiveRule', }, ], { beforeLoad: [ app => { console.log('before load', app); }, ], beforeMount: [ app => { console.log('before mount', app); }, ], afterMount: [ app => { console.log('after mount', app); }, ], afterUnmount: [ app => { console.log('after unload', app); app.render({appContent: '', loading: false}); }, ], } ); start();
Sign up for micro apps

When the micro application information is registered , Once the browser url change , Will automatically trigger qiankun The matching logic of , all activeRule The micro application on the rule matching will be inserted into the specified container in , At the same time, call the life cycle hook exposed by micro application in turn Micro applications need to be in their own portal js ( It's usually what you configure webpack Of entry js) export bootstrap、mount、unmount Three life cycle hooks , For the main application to call at the right time . Micro applications can be accessed without additional installation of any other dependencies qiankun Main application .

/** * bootstrap It will only be called once when the micro application is initialized , The next time the micro application re enters, it will directly call mount hook , No more triggers bootstrap. * Usually we can do some initialization of global variables here , For example, not in unmount Phase is destroyed by the application level cache and so on . */ export async function bootstrap() { console.log('react app bootstraped'); } /** * Every time the application enters, it calls mount Method , Usually we trigger the applied rendering method here */ export async function mount(props) { ReactDOM.render(<App />, props.container ? props.container.querySelector('#root') : document.getElementById('root')); } /** * Apply every time Cut out / uninstall Method to be called , Usually here we will unload the application instance of micro application */ export async function unmount(props) { ReactDOM.unmountComponentAtNode( props.container ? props.container.querySelector('#root') : document.getElementById('root'), ); } /** * Optional lifecycle hooks , Use only loadMicroApp It will take effect when the micro application is loaded in this mode */ export async function update(props) { console.log('update props', props); }

The main application communicates with the sub application project

initGloabalState(state) Define the global state , And return the communication method , The official suggestion is to use it in the main application , Micro application through props Get the communication method . MicroAppStateActions onGlobalStateChange: (callback: OnGlobalStateChangeCallback, fireImmediately?: boolean) => void, Monitor the global state in the current application , There is a change trigger callback,fireImmediately = true Immediately triggered callback setGlobalState: (state: Record) => boolean, Set global state by one level property , In micro application, you can only modify the existing first level attributes offGlobalStateChange: () => boolean, Remove the status monitor of the current application , Microapplication umount Call by default

Main application :

import { initGlobalState, MicroAppStateActions } from 'qiankun'; // initialization state const actions: MicroAppStateActions = initGlobalState(state); actions.onGlobalStateChange((state, prev) => { // state: The changed state ; prev The state before the change console.log(state, prev); }); actions.setGlobalState(state); actions.offGlobalStateChange();


// From life cycle mount Get the communication method in , Usage and master Agreement export function mount(props) { props.onGlobalStateChange((state, prev) => { // state: The changed state ; prev The state before the change console.log(state, prev); }); props.setGlobalState(state); }
js Variable isolation

Every subapplication has its own life cycle , At the same time , Only one instance of the child application will take effect .js Sandbox encased in qiankun In the life cycle of . When a child application is destroyed , Its js The sandbox is destroyed . The only deficiency is ,window The object of , Unable to isolate , It's better not to bind prototypes .

css Pollution

1、scoped( Temporary solutions : The style of the main application uses special class perhaps scoped) 2、 The main application can be set by prefixCls To avoid conflict in a different way 3、 To configure webpack modify less Variable

{ loader: 'less-loader', + options: { + modifyVars: { + '@ant-prefix': 'yourPrefix', + }, + javascriptEnabled: true, + }, }

qiankun Detailed analysis of the source code

This article is from WeChat official account. - javascript art (gh_4e5484fd6b52) , author :zhangjing

The source and reprint of the original text are detailed in the text , If there is any infringement , Please contact the [email protected] Delete .

Original publication time : 2021-04-12

Participation of this paper Tencent cloud media sharing plan , You are welcome to join us , share .

本文为[JavaScript Art]所创,转载请带上原文链接,感谢

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