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

javascript 复制代码

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

www/index.html

javascript 复制代码

<!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

javascript 复制代码

// 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/