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class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>谈谈微前端</h1><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="相关问题">相关问题<a href="#相关问题" class="hash-link" aria-label="Direct link to 相关问题" title="Direct link to 相关问题"></a></h2><ul><li>为什么要用微前端</li><li>微前端的优缺点</li></ul><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="回答关键点">回答关键点<a href="#回答关键点" class="hash-link" aria-label="Direct link to 回答关键点" title="Direct link to 回答关键点"></a></h2><p><code>独立开发</code> <code>独立运行</code> <code>独立部署</code> <code>自治</code></p><p>微前端是一种架构理念,它将较大的前端应用拆分为若干个可以独立交付的前端应用。这样的好处是每个应用大小及复杂度相对可控。在合理拆分应用的前提下,微前端能降低应用之间的耦合度,提升每个团队的自治能力。</p><p>目前市面有各类不同的微前端方案,但没有完美的解决方案。微前端方案通常需要考虑:应用加载机制、通信机制、代码隔离机制等问题。</p><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="知识点深入">知识点深入<a href="#知识点深入" class="hash-link" aria-label="Direct link to 知识点深入" title="Direct link to 知识点深入"></a></h2><p><img loading="lazy" src="https://user-images.githubusercontent.com/17002181/149610173-ea936a56-98a1-416f-a2e5-9058574b32cb.png" class="img_ev3q"></p><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="微前端使用场景">微前端使用场景<a href="#微前端使用场景" class="hash-link" aria-label="Direct link to 微前端使用场景" title="Direct link to 微前端使用场景"></a></h3><p>前端工程化中,一个前端项目常以组件或模块的粒度进行代码拆分,然后通过 script 标签、npm 包、submodules 或者动态加载(Dynamic import)等形式将代码集成到项目中。而微前端则是以更大的粒度对代码进行上下文划分,将较庞大的应用拆分成多个技术栈独立的应用,再通过技术手段将若干应用集成在一个容器内。</p><p>如果项目中存在以下问题,可参考微前端架构进行优化:</p><ul><li><strong>存量系统如何渐进式地拥抱新技术</strong>:存量系统的技术栈老旧,重构和开发成本高。在做新的功能开发时可以考虑采用与老项目不同的技术栈,通过微前端的方案将新的功能与老系统进行集成。同时微前端架构也给老旧系统的技术升级和平滑迁移提供保障。</li><li><strong>大型系统的开发及沟通成本上升</strong>:通过分析业务功能,将系统拆分成多个独立子系统,使每个子系统能独立开发、运行及部署。将工程复杂度拆分并限制在子系统单元内。避免随需求迭代,项目维护成本增大,跨部门沟通困难导致效率低下等问题。</li></ul><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="微前端部分核心能力">微前端部分核心能力<a href="#微前端部分核心能力" class="hash-link" aria-label="Direct link to 微前端部分核心能力" title="Direct link to 微前端部分核心能力"></a></h3><ol><li><p><strong>路由管理</strong></p><p>一般我们使用 Hash 或者 History 模式来对路由进行监听,如 hashchange 或 popstate 事件。</p><p>目前常见的微前端解决方案主要是路由驱动的。在微前端的基座,进行子应用的路由注册,如 <code>{ path: '/microA/*' }</code> ,基座根据路由匹配情况,按需挂载子应用。具体路由跳转规则由子应用接管响应。</p></li><li><p><strong>隔离机制</strong></p><p>支持样式隔离和 JS 沙箱机制,以保证应用之间的样式或全局变量、事件等互不干扰。在应用卸载时,应当对子应用中产生的事件、全局变量、样式表等进行卸载。</p><p>对于新的项目,做好样式隔离的方式包括采用 CSS Module、CSS in JS 或规范使用命名空间等。对于已有项目的 CSS 隔离,可以在打包阶段利用工具(如 postcss)自动对样式添加前缀。</p><p>实现 JS 沙箱机制可以借助 Proxy 和 with 的能力,分别做对 Window 对象的访问进行拦截和修改子应用作用域的操作。不支持 Proxy 的宿主环境,可以采用快照的思路:对进入子应用前的 Window 对象进行快照,用于后续卸载子应用时还原 Window 对象;在卸载子应用时对 Window 对象进行快照,用于后续再次加载子应用时还原 Window 对象。</p></li><li><p><strong>消息通信</strong></p><p>合理划分应用,可以避免频繁的跨应用通信。同时应当避免子应用之间直接通信。</p><p>常见的消息通信机制可以通过原生 CustomEvent 类实现,子应用通过 dispatchEvent 和 addEventListener 来对自定义事件进行下发和监听。除此之外,借助 props 通过主应用向子应用传参,达到通信目的也是常见方法。</p></li><li><p><strong>依赖管理</strong></p><p>常见的微前端框架中,基座应用统一对子应用的状态进行管理。根据路由和子应用状态,按需触发生命周期函数,做请求加载、渲染、卸载等动作。而多个子应用间可能存在一些公共库的依赖。</p><p>为减少这类资源的重复加载,通常可以借助 webpack5 的 Module Federation 在构建时进行公共依赖的配置,实现运行时依赖共享的能力。除了使用打包工具的能力,也可以从代码层面通过实现类 external 功能对公共依赖进行管理。</p></li></ol><h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="关联技术">关联技术<a href="#关联技术" class="hash-link" aria-label="Direct link to 关联技术" title="Direct link to 关联技术"></a></h3><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="web-components">Web Components<a href="#web-components" class="hash-link" aria-label="Direct link to Web Components" title="Direct link to Web Components"></a></h4><p>Web Components 允许开发者不借助框架,实现一些可重用的自定义组件。构建一个 Web Components 通常使用到 customElements、Shadow DOM 的 API,和 templates、slot 标签。</p><p>基于 Web Components 开发,可以天然契合微前端的一些特性:技术栈无关,应用间隔离。但兼容性较差,不支持 IE。</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="iframe">iframe<a href="#iframe" class="hash-link" aria-label="Direct link to iframe" title="Direct link to iframe"></a></h4><p>iframe 常用于将应用嵌入另一个宿主应用中。这其实已经是一种微前端的思维。只使用 iframe 方案引入子应用的好处是浏览器兼容性强,接入成本低,样式及脚本天然隔离。但是由于 iframe 和宿主应用完全隔离,各自独立运行,导致了诸多限制,如:</p><ol><li>资源无法共享;</li><li>iframe 中的 UI 无法跨越 iframe 窗口边界;</li><li>刷新页面时 iframe 中的路由状态丢失;</li></ol><p>目前腾讯提供了一个新的微前端实施思路:借助 ShadowRoot 渲染子应用的 DOM;iframe 负责运行子应用的 JavaScript 代码,从而实现 JS 沙箱和 CSS 隔离能力。另外,在保证子应用和主应用同源的前提下,将子应用的路由变化同步到主应用中,从而保证刷新页面后,路由地址正常。</p><h4 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="webpack5-module-federation">webpack5 Module Federation<a href="#webpack5-module-federation" class="hash-link" aria-label="Direct link to webpack5 Module Federation" title="Direct link to webpack5 Module Federation"></a></h4><p>目前市面上的微前端方案中,有基于 Module Federation 的微前端框架实践。Module Federation 是 webpack 提供的一个插件,他支持通过配置以下核心参数,在打包构建阶段确定集成策略:</p><ol><li>exposes 参数,指定应用可以描述当自己作为被加载的远程模块时,可暴露给其他应用使用的模块路径。</li><li>remotes 参数,指定应用可以从远端加载的远程模块地址。</li><li>shared 参数,指定应用可以与其他远程模块共享的依赖(精确到版本)。</li></ol><h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="参考资料">参考资料<a href="#参考资料" class="hash-link" aria-label="Direct link to 参考资料" title="Direct link to 参考资料"></a></h2><ol><li><a href="https://micro-frontends.org/" target="_blank" rel="noopener noreferrer">micro-frontends</a></li><li><a href="https://github.com/single-spa/single-spa" target="_blank" rel="noopener noreferrer">single-spa</a></li><li><a href="https://github.com/umijs/qiankun" target="_blank" rel="noopener noreferrer">qiankun</a></li><li><a href="https://github.com/modern-js-dev/garfish" target="_blank" rel="noopener noreferrer">garfish</a></li><li><a href="https://github.com/micro-zoe/micro-app" target="_blank" rel="noopener noreferrer">micro-app</a></li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/awesome-interview/book4/engineer-front-end-testing"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">工程化:如何对前端代码实施测试</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/awesome-interview/book4/frame-react-event-mechanism"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">框架:React 事件机制原理</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#相关问题" class="table-of-contents__link toc-highlight">相关问题</a></li><li><a href="#回答关键点" class="table-of-contents__link toc-highlight">回答关键点</a></li><li><a href="#知识点深入" class="table-of-contents__link toc-highlight">知识点深入</a><ul><li><a href="#微前端使用场景" class="table-of-contents__link toc-highlight">微前端使用场景</a></li><li><a href="#微前端部分核心能力" class="table-of-contents__link toc-highlight">微前端部分核心能力</a></li><li><a href="#关联技术" class="table-of-contents__link toc-highlight">关联技术</a><ul><li><a href="#web-components" class="table-of-contents__link toc-highlight">Web Components</a></li><li><a href="#iframe" class="table-of-contents__link toc-highlight">iframe</a></li><li><a href="#webpack5-module-federation" class="table-of-contents__link toc-highlight">webpack5 Module Federation</a></li></ul></li></ul></li><li><a href="#参考资料" class="table-of-contents__link toc-highlight">参考资料</a></li></ul></div></div></div><div class="row"><div class="col"><div class="react-utterences"><div>Loading script...</div></div></div><div class="col col--3"></div></div></div></main></div></div></div>
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