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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 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/modules/storage.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/docs/modules/storage.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/modules/storage.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/docs/modules/storage.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>API</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/api/weex-variable.html" class="sidebar-link">Weex 环境变量</a></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">&lt;a&gt;</a></li><li><a href="/zh/docs/components/div.html" class="sidebar-link">&lt;div&gt;</a></li><li><a href="/zh/docs/components/text.html" class="sidebar-link">&lt;text&gt;</a></li><li><a href="/zh/docs/components/image.html" class="sidebar-link">&lt;image&gt;</a></li><li><a href="/zh/docs/components/list.html" class="sidebar-link">&lt;list&gt;</a></li><li><a href="/zh/docs/components/cell.html" class="sidebar-link">&lt;cell&gt;</a></li><li><a href="/zh/docs/components/loading.html" class="sidebar-link">&lt;loading&gt;</a></li><li><a href="/zh/docs/components/refresh.html" class="sidebar-link">&lt;refresh&gt;</a></li><li><a href="/zh/docs/components/recycle-list.html" class="sidebar-link">&lt;recycle-list&gt;</a></li><li><a href="/zh/docs/components/scroller.html" class="sidebar-link">&lt;scroller&gt;</a></li><li><a href="/zh/docs/components/slider.html" class="sidebar-link">&lt;slider&gt;</a></li><li><a href="/zh/docs/components/indicator.html" class="sidebar-link">&lt;indicator&gt;</a></li><li><a href="/zh/docs/components/textarea.html" class="sidebar-link">&lt;textarea&gt;</a></li><li><a href="/zh/docs/components/input.html" class="sidebar-link">&lt;input&gt;</a></li><li><a href="/zh/docs/components/waterfall.html" class="sidebar-link">&lt;waterfall&gt;</a></li><li><a href="/zh/docs/components/video.html" class="sidebar-link">&lt;video&gt;</a></li><li><a href="/zh/docs/components/web.html" class="sidebar-link">&lt;web&gt;</a></li><li><a href="/zh/docs/components/richtext.html" class="sidebar-link">&lt;richtext&gt;</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading open"><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="active sidebar-link">storage</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/docs/modules/storage.html#setitem" class="sidebar-link">setItem</a></li><li class="sidebar-sub-header"><a href="/zh/docs/modules/storage.html#getitem" class="sidebar-link">getItem</a></li><li class="sidebar-sub-header"><a href="/zh/docs/modules/storage.html#removeitem" class="sidebar-link">removeItem</a></li><li class="sidebar-sub-header"><a href="/zh/docs/modules/storage.html#length" class="sidebar-link">length</a></li><li class="sidebar-sub-header"><a href="/zh/docs/modules/storage.html#getallkeys" class="sidebar-link">getAllKeys</a></li></ul></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"><h1 id="storage"><a href="#storage" class="header-anchor">#</a> storage</h1><p><code>storage</code> 是一个在前端比较常用的模块,可以对本地数据进行存储、修改、删除,并且该数据是永久保存的,除非手动清除或者代码清除。但是,<code>storage</code> 模块有一个限制就是浏览器端(H5)只能存储小于5M的数据,因为在 H5/Web 端的实现是采用 <code>HTML5 LocalStorage API</code>。而 Android 和 iOS 这块是没什么限制的。
storage 常用在一些被用户经常查询,但是又不频繁更新的数据,比如搜索历史、用户的订单列表等。搜索历史一般情况都是作为本地数据存储的,因此使用 storage 比较合适。而用户订单列表是需要本地存储和服务端器检索配合的场景。当一个用户下单后,会经常查阅个人的订单列表。但是,订单的列表数据不是频繁更新的,往往只有在收到货品时,才更新“已签收”,其余平时的状态是“已发货”。因此,可以使用 <code>storage</code> 存储订单列表,可以减少服务器的压力,例如减少 SQL 查询或者缓存的压力。当用户查看订单详情的时候,再更新数据状态。</p><h1 id="api"><a href="#api" class="header-anchor">#</a> API</h1><h2 id="setitem"><a href="#setitem" class="header-anchor">#</a> setItem</h2><p>该方法可以通过键值对的形式将数据存储到本地。同时可以通过该方法,更新已有的数据。</p><h4 id="setitem-key-value-callback"><a href="#setitem-key-value-callback" class="header-anchor">#</a> setItem(key, value, callback)</h4><table><thead><tr><th>参数</th><th>说明</th><th>类型</th></tr></thead><tbody><tr><td>key</td><td>要存储的键,不允许是 <code>&quot;&quot;</code><code>null</code></td><td>string</td></tr><tr><td>value</td><td>要存储的值,不允许是 <code>&quot;&quot;</code><code>null</code></td><td>string</td></tr><tr><td>callback</td><td>执行操作成功后的回调<br><code>e.result</code>:表示设置是否成功,如果成功返回 <code>&quot;success&quot;</code><br><code>e.data</code><code>undefined</code> 表示设置成功,<code>invalid_param</code> 表示 key/value 为 <code>&quot;&quot;</code> 或者 <code>null</code></td><td>function(e)</td></tr></tbody></table><h2 id="getitem"><a href="#getitem" class="header-anchor">#</a> getItem</h2><p>传入键名返回对应的键值。</p><h4 id="getitem-key-callback"><a href="#getitem-key-callback" class="header-anchor">#</a> getItem(key, callback)</h4><table><thead><tr><th>参数</th><th>说明</th><th>类型</th></tr></thead><tbody><tr><td>key</td><td>要获取的值的名称,不允许是 <code>&quot;&quot;</code><code>null</code></td><td>string</td></tr><tr><td>callback</td><td>执行操作成功后的回调<br><code>e.result</code>:表示操作是否成功,如果成功返回 <code>&quot;success&quot;</code><br><code>e.data</code>:获取对应的键值字符串,如果没有找到则返回 <code>undefined</code></td><td>function(e)</td></tr></tbody></table><h2 id="removeitem"><a href="#removeitem" class="header-anchor">#</a> removeItem</h2><p>传入一个键名将会删除本地存储中对应的键值。</p><h4 id="removeitem-key-callback"><a href="#removeitem-key-callback" class="header-anchor">#</a> removeItem(key, callback)</h4><table><thead><tr><th>参数</th><th>说明</th><th>类型</th></tr></thead><tbody><tr><td>key</td><td>要删除的值的名称,不允许是 <code>&quot;&quot;</code><code>null</code></td><td>string</td></tr><tr><td>callback</td><td>执行操作成功后的回调<br><code>e.result</code>:表示删除是否成功,如果成功返回 <code>&quot;success&quot;</code><br><code>e.data</code><code>undefined</code> 表示删除成功</td><td>function(e)</td></tr></tbody></table><h2 id="length"><a href="#length" class="header-anchor">#</a> length</h2><p>返回本地存储的数据中所有存储项数量的整数。</p><h4 id="length-callback"><a href="#length-callback" class="header-anchor">#</a> length(callback)</h4><table><thead><tr><th>参数</th><th>说明</th><th>类型</th></tr></thead><tbody><tr><td>callback</td><td>执行操作成功后的回调<br><code>e.result</code>:表示操作是否成功,如果成功返回 <code>&quot;success&quot;</code><br><code>e.data</code>:当前已存储项的数量</td><td>function(e)</td></tr></tbody></table><h2 id="getallkeys"><a href="#getallkeys" class="header-anchor">#</a> getAllKeys</h2><p>返回一个包含全部已存储项键名的数组。</p><h4 id="getallkeys-callback"><a href="#getallkeys-callback" class="header-anchor">#</a> getAllKeys(callback)</h4><table><thead><tr><th>参数</th><th>说明</th><th>类型</th></tr></thead><tbody><tr><td>callback</td><td>执行操作成功后的回调<br><code>e.result</code>:表示操作是否成功,如果成功返回 <code>&quot;success&quot;</code><br><code>e.data</code>:所有键名组成的数组</td><td>function(e)</td></tr></tbody></table><p><a href="http://dotwe.org/vue/71d1dff37c54fa9bafab4d8cbe3d21e3" target="_blank" rel="noopener noreferrer">示例<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><div class="page-nav"><p class="inner"><span class="prev">
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