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search-box"><input id="algolia-search-input" class="search-query"></form><nav class="nav-links can-hide"><div class="nav-item"><a href="/zh/guide/" class="nav-link">指南</a></div><div class="nav-item"><a href="/zh/docs/" class="nav-link router-link-active">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="/docs/api/weex-variable.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/docs/api/weex-variable.html" class="nav-link router-link-exact-active 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">指南</a></div><div class="nav-item"><a href="/zh/docs/" class="nav-link router-link-active">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="/docs/api/weex-variable.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/docs/api/weex-variable.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 open"><span>API</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/api/weex-variable.html" class="active sidebar-link">Weex 环境变量</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/docs/api/weex-variable.html#属性和方法" class="sidebar-link">属性和方法</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/weex-variable.html#config" class="sidebar-link">config</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/weex-variable.html#document" class="sidebar-link">document</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/weex-variable.html#requiremodule" class="sidebar-link">requireModule</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/weex-variable.html#supports" class="sidebar-link">supports</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/weex-variable.html#isregisteredmodule" class="sidebar-link">isRegisteredModule</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/weex-variable.html#isregisteredcomponent" class="sidebar-link">isRegisteredComponent</a></li></ul></li><li><a href="/zh/docs/api/android-apis.html" class="sidebar-link">Android 接口</a></li><li><a href="/zh/docs/api/ios-apis.html" class="sidebar-link">iOS 接口</a></li><li><a href="/zh/docs/api/js-service.html" class="sidebar-link">JS 服务</a></li><li><a href="/zh/docs/api/broadcast-channel.html" class="sidebar-link">跨页面通信</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>内置组件</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/components/a.html" class="sidebar-link"><a></a></li><li><a href="/zh/docs/components/div.html" class="sidebar-link"><div></a></li><li><a href="/zh/docs/components/text.html" class="sidebar-link"><text></a></li><li><a href="/zh/docs/components/image.html" class="sidebar-link"><image></a></li><li><a href="/zh/docs/components/list.html" class="sidebar-link"><list></a></li><li><a href="/zh/docs/components/cell.html" class="sidebar-link"><cell></a></li><li><a href="/zh/docs/components/loading.html" class="sidebar-link"><loading></a></li><li><a href="/zh/docs/components/refresh.html" class="sidebar-link"><refresh></a></li><li><a href="/zh/docs/components/recycle-list.html" class="sidebar-link"><recycle-list></a></li><li><a href="/zh/docs/components/scroller.html" class="sidebar-link"><scroller></a></li><li><a href="/zh/docs/components/slider.html" class="sidebar-link"><slider></a></li><li><a href="/zh/docs/components/indicator.html" class="sidebar-link"><indicator></a></li><li><a href="/zh/docs/components/textarea.html" class="sidebar-link"><textarea></a></li><li><a href="/zh/docs/components/input.html" class="sidebar-link"><input></a></li><li><a href="/zh/docs/components/waterfall.html" class="sidebar-link"><waterfall></a></li><li><a href="/zh/docs/components/video.html" class="sidebar-link"><video></a></li><li><a href="/zh/docs/components/web.html" class="sidebar-link"><web></a></li><li><a href="/zh/docs/components/richtext.html" class="sidebar-link"><richtext></a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>内置模块</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/modules/animation.html" class="sidebar-link">animation</a></li><li><a href="/zh/docs/modules/clipboard.html" class="sidebar-link">clipboard</a></li><li><a href="/zh/docs/modules/dom.html" class="sidebar-link">dom</a></li><li><a href="/zh/docs/modules/globalEvent.html" class="sidebar-link">globalEvent</a></li><li><a href="/zh/docs/modules/meta.html" class="sidebar-link">meta</a></li><li><a href="/zh/docs/modules/modal.html" class="sidebar-link">modal</a></li><li><a href="/zh/docs/modules/navigator.html" class="sidebar-link">navigator</a></li><li><a href="/zh/docs/modules/picker.html" class="sidebar-link">picker</a></li><li><a href="/zh/docs/modules/storage.html" class="sidebar-link">storage</a></li><li><a href="/zh/docs/modules/stream.html" class="sidebar-link">stream</a></li><li><a href="/zh/docs/modules/webview.html" class="sidebar-link">webview</a></li><li><a href="/zh/docs/modules/websockets.html" class="sidebar-link">webSockets</a></li><li><a href="/zh/docs/modules/deviceInfo.html" class="sidebar-link">deviceInfo</a></li><li><a href="/zh/docs/modules/console-log.html" class="sidebar-link">console-log</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>样式</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/styles/common-styles.html" class="sidebar-link">通用样式</a></li><li><a href="/zh/docs/styles/text-styles.html" class="sidebar-link">文本样式</a></li><li><a href="/zh/docs/styles/css-units.html" class="sidebar-link">CSS 单位</a></li><li><a href="/zh/docs/styles/color-name.html" class="sidebar-link">颜色值</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>事件</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/events/common-events.html" class="sidebar-link">通用事件</a></li><li><a href="/zh/docs/events/event-bubbling.html" class="sidebar-link">事件冒泡</a></li><li><a href="/zh/docs/events/gesture.html" class="sidebar-link">手势</a></li></ul></div></li></ul></div><div class="page"><div class="content"><p>每个 Weex 页面的 JS 上下文中都有一个相互独立的 <code>weex</code> 变量，它可以像全局变量一样使用，不过它在不同页面中是隔离而且<em>只读</em>的。</p><blockquote><p><strong>注意： <code>weex</code> 实例变量只在 Vue 框架中暴露了，目前还不支持在 Rax 框架中使用。</strong></p></blockquote><h2 id="属性和方法"><a href="#属性和方法" class="header-anchor">#</a> 属性和方法</h2><p>Weex 实例变量的类型定义如下：</p><div class="language-typescript extra-class"><pre class="language-typescript"><code><span class="token keyword">declare</span> <span class="token keyword">type</span> Weex <span class="token operator">=</span> <span class="token punctuation">{</span> |
| config<span class="token punctuation">:</span> WeexConfigAPI<span class="token punctuation">;</span> |
| document<span class="token punctuation">:</span> WeexDocument<span class="token punctuation">;</span> |
| <span class="token function-variable function">requireModule</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">name<span class="token punctuation">:</span> <span class="token builtin">string</span></span><span class="token punctuation">)</span> <span class="token operator">=></span> Object <span class="token operator">|</span> <span class="token keyword">void</span><span class="token punctuation">;</span> |
| <span class="token function-variable function">supports</span><span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token parameter">condition<span class="token punctuation">:</span> <span class="token builtin">string</span></span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token builtin">boolean</span> <span class="token operator">|</span> <span class="token keyword">void</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </code></pre></div><h2 id="config"><a href="#config" class="header-anchor">#</a><code>config</code></h2><p>该变量包含了当前 Weex 页面的所有环境信息。</p><div class="language-typescript extra-class"><pre class="language-typescript"><code><span class="token keyword">declare</span> <span class="token keyword">type</span> WeexConfigAPI <span class="token operator">=</span> <span class="token punctuation">{</span> |
| bundleUrl<span class="token punctuation">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span> |
| bundleType<span class="token operator">?</span><span class="token punctuation">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span> |
| env<span class="token punctuation">:</span> WeexEnvironment<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </code></pre></div><ul><li><code>bundleUrl</code>: 当前页面 js bundle 的 URL 地址。</li><li><code>bundleType</code>: <span class="api-version">v0.17+</span> 页面 js bundle 的类型，它表示的是当前页面是用那种框架开发的，可以是 <code>"Vue"</code> 或者 <code>"Rax"</code>。</li><li><code>env</code>: Weex 环境变量。</li></ul><h3 id="weex-环境变量"><a href="#weex-环境变量" class="header-anchor">#</a> Weex 环境变量</h3><p>有时候为了兼容性或者为了增强某个端上的能力，需要编写平台特异的代码。 Weex 提供了 <code>weex.config.env</code> 和全局的 <code>WXEnvironment</code> 变量（它们是等价的）来获取当前执行环境的信息。</p><div class="language-js extra-class"><pre class="language-js"><code>weex<span class="token punctuation">.</span>config<span class="token punctuation">.</span>env <span class="token operator">===</span> WXEnvironment |
| </code></pre></div><p><strong>Weex 环境变量中的字段</strong>:</p><table><thead><tr><th>字段名</th><th>类型</th><th>描述</th></tr></thead><tbody><tr><td><code>platform</code></td><td>String</td><td>Current running platform, could be "Android", "iOS" or "Web".</td></tr><tr><td><code>weexVersion</code></td><td>String</td><td>The version of Weex SDK.</td></tr><tr><td><code>appName</code></td><td>String</td><td>Mobile app name or browser name.</td></tr><tr><td><code>appVersion</code></td><td>String</td><td>The version of current app.</td></tr><tr><td><code>osName</code></td><td>String</td><td>The OS name, could be "Android" or "iOS".</td></tr><tr><td><code>osVersion</code></td><td>String</td><td>The version of current OS.</td></tr><tr><td><code>deviceModel</code></td><td>String</td><td>Mobile phone device model. (native only)</td></tr><tr><td><code>deviceWidth</code></td><td>Number</td><td>Screen resolution width.</td></tr><tr><td><code>deviceHeight</code></td><td>Number</td><td>Screen resolution height.</td></tr></tbody></table><p><a href="http://dotwe.org/vue/ea2cff9039f3b0e406f8f7da10e874af" target="_blank" rel="noopener noreferrer">这个例子<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> 打印出了 Weex 环境对象中的所有值。</p><h2 id="document"><a href="#document" class="header-anchor">#</a><code>document</code></h2><p><code>weex.document</code> 是当前页面的文档模型对象，可以用来创建和操作 DOM 树中元素。它是 Weex DOM API 规范的一部分，但是它和 <a href="https://www.w3.org/DOM/" target="_blank" rel="noopener noreferrer">W3C 的 DOM 规范<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>中的 <code>document</code> 对象是不同的。</p><p>而且，在使用了现代化的前端框架（如 Vue 和 Rax）的情况下，直接操作 DOM 并不是最佳实践。更何况<strong>在 Weex 平台里并不一定有真实的 DOM</strong>，在 Android 和 iOS 端上都是模拟出来的。</p><p>这个接口主要是用在 Vue 和 Rax 框架内部，用于将 virtual-dom 转换成渲染执行，并且发送给 Weex 客户端的渲染引擎。不建议在开发页面时使用。</p><h2 id="requiremodule"><a href="#requiremodule" class="header-anchor">#</a><code>requireModule</code></h2><p>对于那些不依赖 UI 交互的原生功能，Weex 将其封装成<strong>模块</strong>，这是一种通过 javascript 调用原生能力的方法。除了<a href="/zh/docs/modules/animation.html">内置模块</a>以外，将已有的原生模块移植到 Weex 平台也很方便。你可以使用 <code>weex.requireModule</code> 接口引用自定义的或者内置的模块。</p><div class="language-typescript extra-class"><pre class="language-typescript"><code>weex<span class="token punctuation">.</span><span class="token function">requireModule</span><span class="token punctuation">(</span>name<span class="token punctuation">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token punctuation">:</span> Object <span class="token operator">|</span> <span class="token keyword">void</span><span class="token punctuation">;</span> |
| </code></pre></div><p><strong>参数：</strong></p><ul><li>大小写敏感的模块名。</li></ul><p><strong>返回值：</strong></p><ul><li>如果模块已经注册了，返回一个 <code>Proxy</code> 对象（如果环境不支持 <code>Proxy</code> 则返回一个普通对象），可以使用这个对象调用客户端注册的方法。</li><li>如果模块未注册，返回 <code>undefined</code>。</li></ul><h3 id="使用原生模块"><a href="#使用原生模块" class="header-anchor">#</a> 使用原生模块</h3><p>你可以像使用不同 javascript 函数一样使用原生注册的接口。这里是一个简单的<a href="http://dotwe.org/vue/cd7e97f7da08d6d4ca627fc127ab8828" target="_blank" rel="noopener noreferrer">使用 modal 模块的例子<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>：</p><div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>text</span><span class="token punctuation">></span></span>Toast<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>text</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>template</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript"> |
| <span class="token keyword">const</span> modal <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">'modal'</span><span class="token punctuation">)</span> |
| modal<span class="token punctuation">.</span><span class="token function">toast</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| message<span class="token punctuation">:</span> <span class="token string">'I am a toast.'</span><span class="token punctuation">,</span> |
| duration<span class="token punctuation">:</span> <span class="token number">3</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span> |
| </span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span> |
| </code></pre></div><h2 id="supports"><a href="#supports" class="header-anchor">#</a><code>supports</code></h2><blockquote><p>这个接口只在 <span class="api-version">v0.15+</span> 或以上的版本可用。</p></blockquote><p>你应该了解 Weex 的组件和模块都是可以注册和配置的，这样导致了在不同环境中组件和模块的支持情况不一样。你可以使用 <code>weex.supports</code> 接口在运行期检测某个功能在当前环境中是否可用。</p><div class="language-typescript extra-class"><pre class="language-typescript"><code>weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span>condition<span class="token punctuation">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token punctuation">:</span> <span class="token builtin">boolean</span> <span class="token operator">|</span> <span class="token keyword">void</span><span class="token punctuation">;</span> |
| </code></pre></div><p><strong>参数：</strong></p><ul><li>特定格式的字符串：<code>@{type}/{name}</code>。</li></ul><p><code>type</code> 必须是 <code>"component"</code> 和 <code>"module"</code> 之一。<code>name</code> 可以是标签名、模块名，也可以指定模块中的某个方法名（和模块名用 <code>.</code> 隔开）。</p><p><strong>返回值：</strong></p><ul><li>支持该特性，则返回 <code>true</code>。</li><li>不支持该特性，则返回 <code>false</code>。</li><li>参数格式错误或无法确定是否支持，则返回 <code>null</code>。</li></ul><h3 id="使用范例"><a href="#使用范例" class="header-anchor">#</a> 使用范例</h3><p>检测某个组件是否可用：</p><div class="language-js extra-class"><pre class="language-js"><code>weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'@component/slider'</span><span class="token punctuation">)</span> <span class="token comment">// true</span> |
| weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'@component/my-tab'</span><span class="token punctuation">)</span> <span class="token comment">// false</span> |
| </code></pre></div><p>检测某个模块是否可用：</p><div class="language-js extra-class"><pre class="language-js"><code>weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'@module/stream'</span><span class="token punctuation">)</span> <span class="token comment">// true</span> |
| weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'@module/abcdef'</span><span class="token punctuation">)</span> <span class="token comment">// false</span> |
| </code></pre></div><p>检测某个模块是否包含某个方法：</p><div class="language-js extra-class"><pre class="language-js"><code>weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'@module/dom.getComponentRect'</span><span class="token punctuation">)</span> <span class="token comment">// true</span> |
| weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'@module/navigator.jumpToPage'</span><span class="token punctuation">)</span> <span class="token comment">// false</span> |
| </code></pre></div><p>无效的输入：</p><div class="language-js extra-class"><pre class="language-js"><code>weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'div'</span><span class="token punctuation">)</span> <span class="token comment">// null</span> |
| weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'module/*'</span><span class="token punctuation">)</span> <span class="token comment">// null</span> |
| weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'@stream/fetch'</span><span class="token punctuation">)</span> <span class="token operator">/</span><span class="token operator">/</span> <span class="token keyword">null</span> |
| weex<span class="token punctuation">.</span><span class="token function">supports</span><span class="token punctuation">(</span><span class="token string">'getComponentRect'</span><span class="token punctuation">)</span> <span class="token operator">/</span><span class="token operator">/</span> <span class="token keyword">null</span> |
| </code></pre></div><h2 id="isregisteredmodule"><a href="#isregisteredmodule" class="header-anchor">#</a><code>isRegisteredModule</code></h2><p>检测某个特定的模块或者接口是否可用。</p><div class="language-typescript extra-class"><pre class="language-typescript"><code>weex<span class="token punctuation">.</span><span class="token function">isRegisteredModule</span><span class="token punctuation">(</span>moduleName<span class="token punctuation">:</span> <span class="token builtin">string</span><span class="token punctuation">,</span> methodName<span class="token punctuation">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token punctuation">:</span> <span class="token builtin">boolean</span> |
| </code></pre></div><p>这个接口只能用于检测特定模块和方法的兼容性，不支持检测组件。</p><div class="language-js extra-class"><pre class="language-js"><code>weex<span class="token punctuation">.</span><span class="token function">isRegisteredModule</span><span class="token punctuation">(</span><span class="token string">'stream'</span><span class="token punctuation">)</span> <span class="token comment">// true</span> |
| weex<span class="token punctuation">.</span><span class="token function">isRegisteredModule</span><span class="token punctuation">(</span><span class="token string">'stream'</span><span class="token punctuation">,</span> <span class="token string">'fetch'</span><span class="token punctuation">)</span> <span class="token comment">// true</span> |
| weex<span class="token punctuation">.</span><span class="token function">isRegisteredModule</span><span class="token punctuation">(</span><span class="token string">'whatever'</span><span class="token punctuation">,</span> <span class="token string">'- unknown -'</span><span class="token punctuation">)</span> <span class="token comment">// false</span> |
| weex<span class="token punctuation">.</span><span class="token function">isRegisteredModule</span><span class="token punctuation">(</span><span class="token string">'div'</span><span class="token punctuation">)</span> <span class="token comment">// false, not support components</span> |
| </code></pre></div><h2 id="isregisteredcomponent"><a href="#isregisteredcomponent" class="header-anchor">#</a><code>isRegisteredComponent</code></h2><p>检测某个特定的组件是否可用。</p><div class="language-typescript extra-class"><pre class="language-typescript"><code>weex<span class="token punctuation">.</span><span class="token function">isRegisteredComponent</span><span class="token punctuation">(</span>componentName<span class="token punctuation">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token punctuation">:</span> <span class="token builtin">boolean</span> |
| </code></pre></div><p>这个接口只能用于检测组件的兼容性，不支持检测模块。</p><div class="language-js extra-class"><pre class="language-js"><code>weex<span class="token punctuation">.</span><span class="token function">isRegisteredComponent</span><span class="token punctuation">(</span><span class="token string">'div'</span><span class="token punctuation">)</span> <span class="token comment">// true</span> |
| weex<span class="token punctuation">.</span><span class="token function">isRegisteredComponent</span><span class="token punctuation">(</span><span class="token string">'- unknown -'</span><span class="token punctuation">)</span> <span class="token comment">// false</span> |
| weex<span class="token punctuation">.</span><span class="token function">isRegisteredComponent</span><span class="token punctuation">(</span><span class="token string">'navigator'</span><span class="token punctuation">)</span> <span class="token comment">// false, not support modules</span> |
| </code></pre></div></div><div class="page-nav"><p class="inner"><!----><span class="next"><a href="/zh/docs/api/android-apis.html"> |
| Android 接口 |
| </a> |
| → |
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