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虚拟dom及diff算法之 —— snabbdom

news 2025/8/15 20:13:59

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 modulesclassModule, // makes it easy to toggle classespropsModule, // for setting properties on DOM elementsstyleModule, // handles styling on elements with support for animationseventListenersModule // 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