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| <div id="app" data-server-rendered="true"><div class="theme-container vuepress-theme-fast"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div><a href="/zh/" class="home-link router-link-active"><img src="/logo@2x.svg" alt="WEEX" class="logo"></a><span class="version"><a href="/download/download.html" class="version-bg"><img src="/assets/img/version-bg.ab65ded9.svg" alt="v0.28"><span class="version-no">v0.28</span></a></span><div class="links"><form id="search-form" class="algolia-search-wrapper 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router-link-active">简体中文</a></li></ul></div></div></nav><a href="https://github.com/apache/incubator-weex" target="_blank" rel="noopener noreferrer" class="repo-link"><img src="/assets/img/github.7cb484a9.svg" alt="github" class="github-icon"></a></div></header><div class="sidebar-mask"></div><div class="sidebar"><nav class="nav-links"><div class="nav-item"><a href="/zh/guide/" class="nav-link router-link-active">指南</a></div><div class="nav-item"><a href="/zh/docs/" class="nav-link">文档</a></div><div class="nav-item"><a href="/zh/tools/" class="nav-link">第三方工具</a></div><div class="nav-item"><a href="/zh/download/" class="nav-link">下载</a></div><div class="nav-item"><a href="/zh/community/" class="nav-link">社区</a></div><div class="nav-item"><a href="/zh/blog/" class="nav-link">博客</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">选择语言</span><span class="arrow right"></span></a><ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----><a href="/guide/advanced/downgrade.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/guide/advanced/downgrade.html" class="nav-link router-link-exact-active router-link-active">简体中文</a></li></ul></div></div></nav><ul class="sidebar-links"><li><div class="sidebar-group first"><p class="sidebar-heading"><span>快速上手</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/introduction.html" class="sidebar-link">简介</a></li><li><a href="/zh/guide/front-end-frameworks.html" class="sidebar-link">前端框架</a></li><li><a href="/zh/guide/platform-difference.html" class="sidebar-link">平台差异</a></li><li><a href="/zh/guide/use-vue-in-weex.html" class="sidebar-link">在Weex中使用Vue.js</a></li><li><a href="/zh/guide/use-rax-in-weex.html" class="sidebar-link">在Weex中使用Rax.js</a></li><li><a href="/zh/guide/playground.html" class="sidebar-link">Playground 应用</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>开发</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/develop/setup-develop-environment.html" class="sidebar-link">设置开发环境</a></li><li><a href="/zh/guide/develop/create-a-new-app.html" class="sidebar-link">创建一个新的app</a></li><li><a href="/zh/guide/develop/weex_cli.html" class="sidebar-link">Weex CLI</a></li><li><a href="/zh/guide/develop/integrate-to-android-app.html" class="sidebar-link">集成到Android应用</a></li><li><a href="/zh/guide/develop/integrate-to-iOS-app.html" class="sidebar-link">集成到iOS应用</a></li><li><a href="/zh/guide/develop/weex_error_code.html" class="sidebar-link">WEEX常见错误码</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>调试</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/debug/integrate-devtool-to-android.html" class="sidebar-link">集成Devtool到Android</a></li><li><a href="/zh/guide/debug/integrate-devtool-to-ios.html" class="sidebar-link">集成Devtool到iOS</a></li><li><a href="/zh/guide/debug/debug.html" class="sidebar-link">调试</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>扩展</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/extend/extend-android.html" class="sidebar-link">扩展Android能力</a></li><li><a href="/zh/guide/extend/extend-ios.html" class="sidebar-link">扩展iOS能力</a></li><li><a href="/zh/guide/extend/extend-ios-with-swift.html" class="sidebar-link">使用Swift扩展iOS能力</a></li><li><a href="/zh/guide/extend/extend-web.html" class="sidebar-link">扩展Web组件</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading open"><span>高阶特性</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/advanced/asset-path.html" class="sidebar-link">资源路径</a></li><li><a href="/zh/guide/advanced/downgrade.html" class="active sidebar-link">降级方案</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/guide/advanced/downgrade.html#触发降级" class="sidebar-link">触发降级</a></li><li class="sidebar-sub-header"><a href="/zh/guide/advanced/downgrade.html#辅助工具" class="sidebar-link">辅助工具</a></li><li class="sidebar-sub-header"><a href="/zh/guide/advanced/downgrade.html#降级配置项" class="sidebar-link">降级配置项</a></li></ul></li><li><a href="/zh/guide/advanced/use-vuex-and-vue-router.html" class="sidebar-link">使用Vuex和vue-router</a></li><li><a href="/zh/guide/advanced/multi-size-screen.html" class="sidebar-link">适应不同尺寸屏幕</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>贡献</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/contribute/how-to-contribute.html" class="sidebar-link">加入 Weex 社区</a></li><li><a href="/zh/guide/contribute/thanks.html" class="sidebar-link">鸣谢</a></li></ul></div></li></ul></div><div class="page"><div class="content"><h1 id="页面降级"><a href="#页面降级" class="header-anchor">#</a> 页面降级</h1><p>“降级” 通常是指以普通 Web 页面的模式渲染 Weex 的页面。</p><p>Weex 本身是支持跨三种平台的（Android、iOS、Web），在不同平台中集成不同版本的 SDK 来实现原生渲染，然而随着平台和应用版本的迭代，会出现版本碎片化的情况。如果你使用了较高版本中的特性，但是又无法升级已经存在的低版本 App，就可以使用“降级”的方式在低版本 App 中以普通 Web 页面的模式来渲染（在 Web 模式中，渲染器或者说“SDK”也是用 Javascript 实现的，可以动态更新）。</p><blockquote><p>降级是一个与业务属性相关的功能，这里仅提供一份建议和约定，而非技术限制。</p></blockquote><h2 id="触发降级"><a href="#触发降级" class="header-anchor">#</a> 触发降级</h2><p>在 Weex 里，“降级”行为是在前端（页面代码）中触发的，由客户端来实现。触发方式是调用客户端提供的 <code>instanceWrap</code> 模块中的 <code>error</code> 方法来实现。</p><div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> instanceWrap <span class="token operator">=</span> weex<span class="token punctuation">.</span><span class="token function">requireModule</span><span class="token punctuation">(</span><span class="token string">'instanceWrap'</span><span class="token punctuation">)</span> |
| instanceWrap<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>errorType<span class="token punctuation">,</span> errorCode<span class="token punctuation">,</span> message<span class="token punctuation">)</span> |
| </code></pre></div><p><code>instanceWrap</code> 模块仅包含 <code>error</code> 这一个接口，传递的参数主要用于区分降级的类型和原因，与具体业务场景相关，不做强限制，大致的约定如下。</p><ul><li><code>errorType</code>: 【数字】 错误类型。由前端触发的降级通常约定为 <code>1</code>。</li><li><code>errorCode</code>: 【数字】 错误代码。 |
| <ul><li><code>1001</code>: 系统版本不满足条件。</li><li><code>1002</code>: 应用版本不满足条件。</li><li><code>1003</code>: WeexSDK 版本不满足条件。</li><li><code>1004</code>: 设备型号不满足条件。</li></ul></li><li><code>message</code>: 【字符串】 错误信息。</li></ul><blockquote><p>在页面代码任意位置调用了降级接口都会立即触发降级，比较常见的做法是在渲染页面之前，先判断环境信息是否满足需求，然后触发降级。</p></blockquote><h2 id="辅助工具"><a href="#辅助工具" class="header-anchor">#</a> 辅助工具</h2><p>为了方便使用，Weex 提供了一系列辅助模块/插件来实现降级功能。</p><h3 id="npm-模块"><a href="#npm-模块" class="header-anchor">#</a> Npm 模块</h3><ul><li>npm 模块主页： <a href="https://www.npmjs.com/package/@weex-project/downgrade" target="_blank" rel="noopener noreferrer">https://www.npmjs.com/package/@weex-project/downgrade<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li><li>源码地址： <a href="https://github.com/weexteam/downgrade" target="_blank" rel="noopener noreferrer">https://github.com/weexteam/downgrade<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul><p>首先安装 <code>@weex-project/downgrade</code> 模块，然后在页面代码中引入，调用其中的接口即可触发降级。</p><div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">import</span> downgrade <span class="token keyword">from</span> <span class="token string">'@weex-project/downgrade'</span> |
| </code></pre></div><p>提供的接口如下：</p><h4 id="force"><a href="#force" class="header-anchor">#</a><code>force()</code></h4><p>强制降级。调用该接口可以无条件立即降级。</p><div class="language-js extra-class"><pre class="language-js"><code>downgrade<span class="token punctuation">.</span><span class="token function">force</span><span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre></div><h4 id="check-options"><a href="#check-options" class="header-anchor">#</a><code>check(options)</code></h4><p>检查环境信息是否满足 <code>options</code> 的描述，返回校验结果，<strong>并不会触发降级</strong>。</p><p><code>options</code> 的格式见下文详解，返回值的格式如下：</p><ul><li><code>isDowngrade</code>: 是否应该降级（不满足 <code>options</code> 中的条件则为 <code>true</code>）。</li><li><code>errorType</code>: 错误类型，语义同上，仅 <code>isDowngrade</code> 为 <code>true</code> 时才包含。</li><li><code>code</code>: 错误代码，语义同上，仅 <code>isDowngrade</code> 为 <code>true</code> 时才包含。</li></ul><div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> result <span class="token operator">=</span> downgrade<span class="token punctuation">.</span><span class="token function">check</span><span class="token punctuation">(</span><span class="token punctuation">{</span> ios<span class="token punctuation">:</span> <span class="token punctuation">{</span> osVersion<span class="token punctuation">:</span> <span class="token string">'<=9.0'</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> |
| <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>result<span class="token punctuation">.</span>isDowngrade<span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token comment">// Do something</span> |
| <span class="token punctuation">}</span> |
| </code></pre></div><h4 id="condition-options"><a href="#condition-options" class="header-anchor">#</a><code>condition(options)</code></h4><p>检查环境信息是否满足 <code>options</code> 的描述，<strong>不满足条件则触发降级</strong>。 <code>options</code> 的格式见下文详解，没有返回值。</p><div class="language-js extra-class"><pre class="language-js"><code>downgrade<span class="token punctuation">.</span><span class="token function">condition</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| android<span class="token punctuation">:</span> <span class="token punctuation">{</span> |
| appVersion<span class="token punctuation">:</span> <span class="token string">'<=7.8.0'</span><span class="token punctuation">,</span> |
| weexVersion<span class="token punctuation">:</span> <span class="token string">'<0.16.0'</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span> |
| </code></pre></div><h3 id="webpack-插件"><a href="#webpack-插件" class="header-anchor">#</a> Webpack 插件</h3><p>Weex 提供了一个 Webpack 插件 <a href="https://www.npmjs.com/package/webpack-plugin-downgrade" target="_blank" rel="noopener noreferrer"><code>webpack-plugin-downgrade</code><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a> 支持在打包时注入触发降级的代码。</p><div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// webpack.config.js</span> |
| <span class="token keyword">var</span> DowngradePlugin <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack-plugin-downgrade'</span><span class="token punctuation">)</span> |
| |
| module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span> |
| <span class="token comment">// other configs ...</span> |
| |
| plugins<span class="token punctuation">:</span> <span class="token punctuation">[</span> |
| <span class="token keyword">new</span> <span class="token class-name">DowngradePlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token comment">/* downgrade options */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> |
| <span class="token punctuation">]</span> |
| <span class="token punctuation">}</span> |
| </code></pre></div><p>插件支持的配置项如下：</p><ul><li><code>force</code>: <code>Boolean</code> 是否强制降级。</li><li><code>condition</code>: <code>Object</code> 满足特定条件时才触发降级。具体的配置项见下文详解。</li></ul><div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 强制降级</span> |
| <span class="token keyword">new</span> <span class="token class-name">DowngradePlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span> force<span class="token punctuation">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> |
| |
| <span class="token comment">// 满足某些条件时降级</span> |
| <span class="token keyword">new</span> <span class="token class-name">DowngradePlugin</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| condition<span class="token punctuation">:</span> <span class="token punctuation">{</span> |
| ios<span class="token punctuation">:</span> <span class="token punctuation">{</span> |
| deviceModel<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token string">'iPhone5,1'</span><span class="token punctuation">]</span> |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| android<span class="token punctuation">:</span> <span class="token punctuation">{</span> |
| osVersion<span class="token punctuation">:</span> <span class="token string">'<=4.4'</span><span class="token punctuation">,</span> |
| weexVersion<span class="token punctuation">:</span> <span class="token string">'<0.16.0'</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span> |
| </code></pre></div><h2 id="降级配置项"><a href="#降级配置项" class="header-anchor">#</a> 降级配置项</h2><p>降级配置项是一个普通的 JS 对象，包含 <code>ios</code> 和 <code>android</code> 两个字段，这两个字段内部的配置项的语义都是一样的。满足配置项中的任意一个条件就会触发降级。</p><table><thead><tr><th>字段</th><th>数据格式</th><th>含义</th></tr></thead><tbody><tr><td><code>osVersion</code></td><td>语义化版本号</td><td>手机操作系统的版本范围</td></tr><tr><td><code>appVersion</code></td><td>语义化版本号</td><td>App 应用的版本范围</td></tr><tr><td><code>weexVersion</code></td><td>语义化版本号</td><td>WeexSDK 的版本范围</td></tr><tr><td><code>deviceModel</code></td><td>由设备机型字符串构成的数组</td><td>需要降级的机型列表</td></tr></tbody></table><div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> options <span class="token operator">=</span> <span class="token punctuation">{</span> |
| <span class="token comment">// 在 Android 中的配置项</span> |
| android<span class="token punctuation">:</span> <span class="token punctuation">{</span> |
| <span class="token comment">// 在低于 4.5 的安卓系统中降级</span> |
| osVersion<span class="token punctuation">:</span> <span class="token string">'<4.5'</span><span class="token punctuation">,</span> |
| |
| <span class="token comment">// 仅在 8.1.10 版本的 App 中降级</span> |
| appVersion<span class="token punctuation">:</span> <span class="token string">'8.1.10'</span> |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| |
| <span class="token comment">// 在 iOS 中的配置项</span> |
| ios<span class="token punctuation">:</span> <span class="token punctuation">{</span> |
| <span class="token comment">// 在小于等于 WeexSDK 0.18.2 的版本中降级</span> |
| weexVersion<span class="token punctuation">:</span> <span class="token string">'<=0.18.2'</span><span class="token punctuation">,</span> |
| |
| <span class="token comment">// 在 iPhone 5 和 iPhone 5s 中降级</span> |
| deviceModel<span class="token punctuation">:</span> <span class="token punctuation">[</span> <span class="token string">'iPhone5,1'</span><span class="token punctuation">,</span> <span class="token string">'iPhone6,1'</span> <span class="token punctuation">]</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| </code></pre></div><h3 id="语义化版本号"><a href="#语义化版本号" class="header-anchor">#</a> 语义化版本号</h3><p>在辅助降级的工具包中，实现了简版的 <a href="https://semver.org/" target="_blank" rel="noopener noreferrer">Semantic Versioning<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a>（语义化版本号）来匹配版本，<strong>仅支持使用 <code>></code> 、 <code><</code> 、 <code>=</code> 、 <code>>=</code> 、 <code><=</code> 这五种比较符。</strong></p><h3 id="设备型号"><a href="#设备型号" class="header-anchor">#</a> 设备型号</h3><p>设备型号由手机设备厂商定义，降级配置项中需要列举出所有想要降级的设备型号。</p></div><div class="page-nav"><p class="inner"><span class="prev"> |
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