虚拟dom及diff算法之 —— snabbdom

源码:https://github.com/snabbdom/snabbdom

测试环境搭建

npm i -S snabbdom
安装好的node_modules提供了js和ts的代码:build:js代码,src:ts代码

npm i -D webpack@5 webpack-cli@3 webpack-dev-server@3
webpack:构建工具,必须安装5版本的,因为5版本才支持exports导出的能力
webpack-dev-server:提供8080端口访问

package.json中配置运行文件的入口

"scripts": {
 "dev": "webpack-dev-server"
},

www/index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- src/index.js中需要一个container容器 -->
    <div id="container">你好</div>
    <script src="/xuni/bundle.js"></script>
  </body>
</html>

src/index.js

// 官方demo,参照https://github.com/snabbdom/snabbdom配置
import { init, classModule, propsModule, styleModule, eventListenersModule, h } from 'snabbdom'

const patch = init([
  // Init patch function with chosen modules
  classModule, // makes it easy to toggle classes
  propsModule, // for setting properties on DOM elements
  styleModule, // handles styling on elements with support for animations
  eventListenersModule // attaches event listeners
])

const container = document.getElementById('container')

const vnode = h('div#container.two.classes', { on: { click: () => console.log('div clicked') } }, [
  h('span', { style: { fontWeight: 'bold' } }, 'This is bold'),
  ' and this is just normal text',
  h('a', { props: { href: '/foo' } }, "I'll take you places!")
])
// Patch into empty DOM element – this modifies the DOM as a side effect
patch(container, vnode)

const newVnode = h('div#container.two.classes', { on: { click: () => console.log('updated div clicked') } }, [
  h('span', { style: { fontWeight: 'normal', fontStyle: 'italic' } }, 'This is now italic type'),
  ' and this is still just normal text',
  h('a', { props: { href: '/bar' } }, "I'll take you places!")
])
// Second `patch` invocation
patch(vnode, newVnode) // Snabbdom efficiently updates the old view to the new state

运行:yarn dev

访问:http://localhost:8080/

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