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库来传入真正宿主元素的更新方法(HostConfig)。基于这个库可以方便的实现出 ReactDOM、RN 等 react 渲染层。remax 就是基于该组件实现的一个 react 的渲染层，不过小程序里不能直接去更新界面，所以 reamx 会把更新收集起来，然后生成一个更新数据通过小程序的 setData 触发渲染层的更新。然后在小程序渲染层实现一个通用模板来渲染这些数据。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"这个方案带来的好处和缺点，在微信小程序里的性能限制下面 remax 和 taro next 的原理介绍里都讲得很透彻，这里就不在复述了。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"remax 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查找文件后缀的优先级顺序就好了。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/58\/e0\/58f9996f03eb75297812fc4be8470fe0.png","alt":null,"title":"","style":[{"key":"width","value":"100%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"最终打包时在 H5 端使用 index.web.js 内导出的兼容组件，其他端用 index.js 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{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"一、方案背景"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"长期以来 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可行，后续到小程序的方案也深受启发。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"3、react-native-web 原理"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"先看一行 RN 代码："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/24\/c1\/240c2ae1135294586186a873b952d1c1.png","alt":null,"title":"","style":[{"key":"width","value":"100%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"再看 react-native-web 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RN 的组件和 API 都用 H5 实现适配一遍，适配其行为和默认样式，在打包的时候使用 webpack 的别名机制将用到的组件替换成 react-native-web 里的对应组件。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"简单的方案实现起来工作量还是挺大的，所以 react-native-web 里也大量的直接使用了 react-native 的源代码，谁让他们都是 JS 呢。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"既然到 H5 可以这么简单粗暴，那到小程序是否可以呢？"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"4、RN 到小程序"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"我们知道小程序都有一套自己的 DSL 语言，而且与常规前端不同的是他将逻辑层和视图层完全隔离在了两个线程里，两边数据和对象都不共享，只能通过 Native 层来传递数据通讯。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"RN 广义上来说也是一样的双线程机制，不过 RN 的渲染是用的 native，小程序用的是 webkit。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"RN 是完全基于 React 语言的，比小程序的 DSL 要灵活复杂得多，要把 React 语法和 JSX 编译成一个子集的话困难性还是很大的。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"这个时候我们想到了 remax：使用真正的 react 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