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<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>Mobx是一个功能强大，上手非常容易的状态管理工具。其他状态管理工具有Flux，redux，dva</p>
<h2 id="基本用法"><a href="#基本用法" class="headerlink" title="基本用法"></a>基本用法</h2><h3 id="安装"><a href="#安装" class="headerlink" title="安装"></a>安装</h3><p>mobx安装：<code>npm install mobx --save</code> 或 <code>yarn add mobx -S</code>，如果与react进行搭配使用的话，则需要安装mobx-react: <code>npm install mobx-react --save</code></p>
<h3 id="概念"><a href="#概念" class="headerlink" title="概念"></a>概念</h3><p>mobx支持单项数据流，也就是通过action去改变状态，然后状态的改变会更新所有受影响的视图。其中主要用到的几个要点有：</p>
<blockquote>
<p>abservable</p>
</blockquote>
<p>abservable定义状态为可观察状态，其数据结构不限定，可以是基本数据类型，也可以是引用类型。例如：</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line">inport { observable } from 'mobx';</div><div class="line"></div><div class="line">const appStore = abservable({</div><div class="line"> todos: []</div><div class="line">});</div><div class="line"></div><div class="line">// 或者使用装饰器形式展示</div><div class="line">@observable appStore = {</div><div class="line"> todos: []</div><div class="line">};</div></pre></td></tr></table></figure>
</code></pre><blockquote>
<p>action</p>
</blockquote>
<p>有了可观察的状态，那么就需要操作可观察状态的动作，action的作用就是为了改变状态的。同样也分为两种形式展示：</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line">import { action } from 'mobx';</div><div class="line"></div><div class="line">appStore.resetTodos = action(function reset() {</div><div class="line"> appStore.todos = [];</div><div class="line">});</div><div class="line"></div><div class="line">@action resetTodos() {</div><div class="line"> appStore.todos = [];</div><div class="line">}</div></pre></td></tr></table></figure>
</code></pre><blockquote>
<p>computed</p>
</blockquote>
<p>计算值(computed values)是可以根据现有的状态或其它计算值衍生出的值。如果任何影响计算值的值发生变化了，计算值将根据状态自动进行衍生。例如：</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">import { computed } from 'mobx';</div><div class="line"></div><div class="line">@computed get unfinishedTodos() {</div><div class="line"> return this.props.appStore.filter((todo) => !todo.finished).length;</div><div class="line">}</div></pre></td></tr></table></figure>
</code></pre><blockquote>
<p>autorun</p>
</blockquote>
<p>当你想创建一个响应式函数，而该函数本身永远不会有观察者时，可以使用<code>mobx autorun</code>。这通常需要你从反应式代码桥接到命令式代码的情况。例如打印日志，持久化或是更新UI的情况。当使用<code>autorun</code>时，所提供的函数总是被触发一次，然后他的依赖关系每次触发时会再次被触发。</p>
<p>传递给<code>autorun</code>的函数在调用后会接收一个参数，可用于在执行期间清理<code>autorun</code>。</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line">var numbers = observable([1,2,3]);</div><div class="line">var sum = computed(() => numbers.reduce((a, b) => a + b, 0));</div><div class="line"></div><div class="line">var disposer = autorun(() => console.log(sum.get()));</div><div class="line">// 输出 '6'</div><div class="line">numbers.push(4);</div><div class="line">// 输出 '10'</div><div class="line"></div><div class="line">disposer();</div><div class="line">numbers.push(5);</div><div class="line">// 不会再输出任何值。`sum` 不会再重新计算。</div></pre></td></tr></table></figure>
</code></pre><blockquote>
<p>when</p>
<p>reaction</p>
<p>observer</p>
</blockquote>
<p><code>observer</code> 函数/装饰器可以用来将react组件转变为响应式组件。它用<code>mobx.autorun</code>来包装了组件的render函数以确保任何组件渲染中使用了数据变化时都可以强制刷新组件。<code>observer</code>是由单独的<code>mobx-react</code>包提供的。</p>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line">import {observer} from "mobx-react";</div><div class="line"></div><div class="line">var timerData = observable({</div><div class="line"> secondsPassed: 0</div><div class="line">});</div><div class="line"></div><div class="line">setInterval(() => {</div><div class="line"> timerData.secondsPassed++;</div><div class="line">}, 1000);</div><div class="line"></div><div class="line">@observer class Timer extends React.Component {</div><div class="line"> render() {</div><div class="line"> return (<span>Seconds passed: { this.props.timerData.secondsPassed } </span> )</div><div class="line"> }</div><div class="line">};</div><div class="line"></div><div class="line">ReactDOM.render(<Timer timerData={timerData} />, document.body);</div></pre></td></tr></table></figure>
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<a class="post-title-link" href="/2018/07/04/devtools/" itemprop="url">devtools使用技巧</a></h1>
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<ol>
<li>通过 console 面板修改页面元素及元素内容</li>
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<ul>
<li>获取元素节点</li>
<li>右键选择 <code>Edit as HTML</code> 或者 <code>Edit Text</code></li>
<li>修改后的内容会实时反映在页面和 <code>Elements</code> 面板上</li>
</ul>
<ol>
<li>inspect() / CTRL + L</li>
</ol>
<ul>
<li><p>在 <code>console</code> 面板使用 <code>inspect(elem)</code> 跳转到 <code>elements</code> 面板的指定元素节点</p>
<pre><code>inspect($('#header'))
inspect(document.getElementById('header'))
</code></pre></li>
<li><p>使用 <code>ctrl + l</code> 清空当前的的 <code>console</code> 面板</p>
</li>
</ul>
<ol>
<li><p>使用 <code>ctrl + P</code> / <code>ctrl + O</code> 来查找需要的文件，<code>ctrl + g</code>来确定当前需要查找文件的位置</p>
</li>
<li><p>使用<code>alt + -</code>和<code>alt + =</code>来在上一个鼠标位置或下一个鼠标位置进行跳转</p>
</li>
<li><p>使用<code>alt + 鼠标左键click</code>，可以在文件中创建多个编辑点</p>
</li>
<li><p>使用<code>alt + shift + 鼠标左键click</code>，可以创造一个矩形选区</p>
</li>
<li><p>在<code>Elements</code>面板右侧的<code>Event Listeners</code>选项卡中，在绑定的事件上右键可以跳转到相应的js代码上</p>
</li>
<li><p>使用 <code>console.trace()</code> 可以追踪代码执行过程中的栈信息</p>
</li>
<li><p>使用 <code>console.time('sign string')</code> 和 <code>console.timeEnd('sign string')</code> 获取中间的间隔时间</p>
</li>
<li><p>手动阻塞 URL 的加载，用于测试资源获取失败的页面效果。在<code>network</code>面板上点击你需要阻塞的那个文件，然后右键选择<code>Block Request URL</code>，然后刷新就可以看到效果了</p>
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<p>不按照react-native中文网上的来的话，只需要五步就可以完成react-native的demo运行。</p>
<ol>
<li>下载并安装jdk，以安装jdk8为例</li>
<li>配置环境变量<br>（1）配置android的环境变量<br>ANDROID_HOME — C:\Users\cyy\AppData\Local\Android\Sdk<br>（2）配置java的环境变量<br>JAVA_HOME — C:\Program Files\Java\jdk1.8.0_171<br>（3）在path中配置platform-tools的环境变量<br>PATH — C:\Users\cyy\AppData\Local\Android\Sdk\platform-tools</li>
<li>下载android-studio，解压后点击android-studio\bin\studio.exe，然后在android-studio中配置jdk可以根据中文网上的说明进行配置</li>
<li>运行device，点击android-studio右上角的AVD Manager，选择适当的手机模拟器设备，一般参见“Nexus 5X API 24” - “android 7.0”，然后点击运行就可以了。中文网上面用Genymotion 使用起来比较繁琐</li>
<li>初始化项目<br>（1）react-native init android-init-name<br>（2）cd android-init-name<br>（3）react-native run-android</li>
</ol>
<p>另外，如果一个项目在react-native run-android运行起来的时候报错，可以试着删除“android\build”和“android\app\build”后再运行。</p>
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<a class="post-title-link" href="/2018/06/12/upload-and-export/" itemprop="url">上传与下载</a></h1>
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<h3 id="上传"><a href="#上传" class="headerlink" title="上传"></a>上传</h3><p>上传我借鉴的是ant-design的组件进行上传的，具体源代码还没有参考，这块留起来后续补充。</p>
<h4 id="ant-design组件"><a href="#ant-design组件" class="headerlink" title="ant-design组件"></a>ant-design组件</h4><p><a href="https://ant.design/components/upload-cn/" target="_blank" rel="external">Upload</a>组件</p>
<h4 id="源码解析"><a href="#源码解析" class="headerlink" title="源码解析"></a>源码解析</h4><blockquote>
<p>后续补充</p>
</blockquote>
<h3 id="下载"><a href="#下载" class="headerlink" title="下载"></a>下载</h3><p>下载我是参考了<a href="https://www.cnblogs.com/cynthia-wuqian/p/7927621.html" target="_blank" rel="external">这边文章</a>，因为下载时返回的数据是一串乱码，所以就借鉴了这边文章缩写的，需要在axios中加入<code>responseTtpe: 'arraybuffer'</code>，然后用了blob，具体代码如下：</p>
<pre><code>axios.post(url, {...params}, {
header: {
// 这里是header设置
},
responseType: 'arraybuffer'
}).then((res) => {