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<article id="post-vue2组件通信-使用dispatch和broadcast" class="article article-type-post " itemscope itemprop="blogPost">
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<h1 class="article-title" itemprop="name">
vue2 组件通信——使用 dispatch 和 broadcast
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<a href="/vue2组件通信-使用dispatch和broadcast/" class="archive-article-date">
<time datetime="2017-09-01T09:37:44.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2017-09-01</time>
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<p>最近在使用 <a href="http://element.eleme.io/" target="_blank" rel="noopener">Element</a> 过程中发现组件通信大量使用 <code>dispatch</code> 和 <code>broadcast</code> 两个方法，之前在 <a href="https://lz5z.com/vue2%E7%BB%84%E4%BB%B6%E9%80%9A%E4%BF%A1/">vue2 组件通信</a> 也提到过 vue2 中取消了 <code>$dispatch</code> 和 <code>$broadcast</code> 两个重要的事件，而 Element 重新实现了这两个函数。</p>
<p>代码地址放在 <a href="https://github.com/ElemeFE/element/blob/dev/src/mixins/emitter.js" target="_blank" rel="noopener"><code>element-ui/lib/mixins/emitter</code></a></p>
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<p><strong>emitter.js</strong></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">"use strict"</span>;</span><br><span class="line"></span><br><span class="line">exports.__esModule = <span class="literal">true</span>;</span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">_broadcast</span>(<span class="params">componentName, eventName, params</span>) </span>{</span><br><span class="line"> <span class="keyword">this</span>.$children.forEach(<span class="function"><span class="keyword">function</span> (<span class="params">child</span>) </span>{</span><br><span class="line"> <span class="keyword">var</span> name = child.$options.componentName;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (name === componentName) {</span><br><span class="line"> child.$emit.apply(child, [eventName].concat(params));</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> _broadcast.apply(child, [componentName, eventName].concat([params]));</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line">}</span><br><span class="line">exports.default = {</span><br><span class="line"> methods: {</span><br><span class="line"> dispatch: <span class="function"><span class="keyword">function</span> <span class="title">dispatch</span>(<span class="params">componentName, eventName, params</span>) </span>{</span><br><span class="line"> <span class="keyword">var</span> parent = <span class="keyword">this</span>.$parent || <span class="keyword">this</span>.$root;</span><br><span class="line"> <span class="keyword">var</span> name = parent.$options.componentName;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">while</span> (parent && (!name || name !== componentName)) {</span><br><span class="line"> parent = parent.$parent;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (parent) {</span><br><span class="line"> name = parent.$options.componentName;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (parent) {</span><br><span class="line"> parent.$emit.apply(parent, [eventName].concat(params));</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> broadcast: <span class="function"><span class="keyword">function</span> <span class="title">broadcast</span>(<span class="params">componentName, eventName, params</span>) </span>{</span><br><span class="line"> _broadcast.call(<span class="keyword">this</span>, componentName, eventName, params);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<h3>解析</h3>
<p><code>dispatch</code> 和 <code>broadcast</code> 方法都需要 3 个参数，<code>componentName</code> 组件名称， <code>eventName</code> 事件名称， <code>params</code> 传递的参数。</p>
<p><code>dispatch</code> 方法会寻找所有的父组件，直到找到名称为 <code>componentName</code> 的组件，调用其 <code>$emit()</code> 事件。<code>broadcast</code> 方法则是遍历当前组件的所有子组件，找到名称为 <code>componentName</code> 的子组件，然后调用其 <code>$emit()</code> 事件。</p>
<p>这里也看出了 Element 中的 <code>dispatch</code> 与 <code>broadcast</code> 的不同，vue1 中的 <code>$dispatch</code> 和 <code>$broadcast</code> 会将事件通知给所有的 父/子 组件，只要其监听了相关事件，都能够（能够，不是一定）触发；而 Element 则更像是定向爆破，指哪打哪，其实更符合我们日常的需求。</p>
<h3>使用方式</h3>
<p>兄弟组件之间的通信可以很好的诠释上述两个事件。假设父组件 <strong>App.vue</strong> 中引入了两个子组件 <strong>Hello.vue</strong> 和 <strong>Fuck.vue</strong>。<br>
如果你的项目中巧合使用了 Element，那可以按照下面的方式将其引入进来，如果没有用 Element 也不用担心，复制上面的 <code>emitter.js</code>，通过 mixins 的方式引入即可。</p>
<p>在 <strong>App.vue</strong> 中监听 <code>message</code> 事件，收到事件后，通过 <code>broadcast</code> 和接收到的参数，将事件定向传播给相关组件。</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag"><<span class="name">template</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">div</span> <span class="attr">id</span>=<span class="string">"app"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">hello</span>></span><span class="tag"></<span class="name">hello</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">fuck</span>></span><span class="tag"></<span class="name">fuck</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">div</span>></span></span><br><span class="line"><span class="tag"></<span class="name">template</span>></span></span><br><span class="line"></span><br><span class="line"><span class="tag"><<span class="name">script</span>></span></span><br><span class="line"><span class="javascript"> <span class="keyword">import</span> Hello <span class="keyword">from</span> <span class="string">'components/Hello'</span></span></span><br><span class="line"><span class="javascript"> <span class="keyword">import</span> Fuck <span class="keyword">from</span> <span class="string">'components/Fuck'</span></span></span><br><span class="line"><span class="javascript"> <span class="keyword">import</span> Emitter <span class="keyword">from</span> <span class="string">'element-ui/lib/mixins/emitter'</span></span></span><br><span class="line"></span><br><span class="line"><span class="javascript"> <span class="keyword">export</span> <span class="keyword">default</span> {</span></span><br><span class="line"><span class="actionscript"> name: <span class="string">'app'</span>,</span></span><br><span class="line"><span class="actionscript"> componentName: <span class="string">'ROOT'</span>,</span></span><br><span class="line"> mixins: [Emitter],</span><br><span class="line"> components: {</span><br><span class="line"> Hello,</span><br><span class="line"> Fuck</span><br><span class="line"> },</span><br><span class="line"> created () {</span><br><span class="line"><span class="actionscript"> <span class="keyword">this</span>.$on(<span class="string">'message'</span>, params => {</span></span><br><span class="line"><span class="actionscript"> <span class="keyword">this</span>.broadcast(params.componentName, params.eventName, params.text)</span></span><br><span class="line"> })</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"><span class="tag"></<span class="name">script</span>></span></span><br></pre></td></tr></table></figure>
<p><strong>Fuck.vue</strong> 与 <strong>Hello.vue</strong> 的内容基本相同，下面只列出 <strong>Fuck.vue</strong></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> Emitter <span class="keyword">from</span> <span class="string">'element-ui/lib/mixins/emitter'</span></span><br><span class="line"><span class="keyword">import</span> event <span class="keyword">from</span> <span class="string">'mixins/event'</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> {</span><br><span class="line"> componentName: <span class="string">'Fuck'</span>,</span><br><span class="line"> mixins: [Emitter, event],</span><br><span class="line"> data () {</span><br><span class="line"> <span class="keyword">return</span> {</span><br><span class="line"> name: <span class="string">'Fuck'</span>,</span><br><span class="line"> textarea: <span class="string">''</span>,</span><br><span class="line"> tableData: []</span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> methods: {</span><br><span class="line"> submit () {</span><br><span class="line"> <span class="keyword">this</span>.communicate(<span class="string">'message'</span>, {</span><br><span class="line"> componentName: <span class="string">'Hello'</span>,</span><br><span class="line"> text: <span class="keyword">this</span>.textarea</span><br><span class="line"> })</span><br><span class="line"> <span class="keyword">this</span>.textarea = <span class="string">''</span></span><br><span class="line"> }</span><br><span class="line"> },</span><br><span class="line"> created () {</span><br><span class="line"> <span class="keyword">this</span>.$on(<span class="string">'message'</span>, text => {</span><br><span class="line"> <span class="keyword">this</span>.tableData.push(<span class="keyword">this</span>.getMessage(text))</span><br><span class="line"> })</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><strong>mixins/event.js</strong></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> Emitter <span class="keyword">from</span> <span class="string">'element-ui/lib/mixins/emitter'</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> {</span><br><span class="line"> mixins: [Emitter],</span><br><span class="line"> methods: {</span><br><span class="line"> communicate (event, params = {}) {</span><br><span class="line"> <span class="keyword">this</span>.dispatch(<span class="string">'ROOT'</span>, event, <span class="built_in">Object</span>.assign({</span><br><span class="line"> eventName: event</span><br><span class="line"> }, params))</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><strong>Fuck.vue</strong> 中监听了 <code>message</code> 事件，当收到消息时，向 <code>tableData</code> 中加入新的值。而 <code>summit</code> 方法则调用 <code>event.js</code> 中的 <code>communicate</code> 方法，通过 <code>dispatch</code> 方法将事件传播给 <code>ROOT</code> 组件。</p>
<p><a href="https://github.com/Leo555/vue_communication" target="_blank" rel="noopener">完整代码地址</a></p>
<h2>vue 组件通信方式总结</h2>
<ol>
<li>父组件向子组件传递信息使用 props down</li>
<li>子组件向父组件传递信息使用 event up</li>
<li>其它关系类型组件通信使用 global event bus</li>
<li>大型 SPA 组件之间通信使用 Vuex 管理组件状态</li>
<li>使用 Element 下 emitter.js 中的 dispatch 和 broadcast 做事件定向传播</li>
</ol>
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<a href="javascript:void(0)" class="js-tag color3">进程</a>
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<a href="javascript:void(0)" class="js-tag color3">listagg</a>
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<a href="javascript:void(0)" class="js-tag color2">Pandas</a>
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<a href="javascript:void(0)" class="js-tag color2">RegExp</a>
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<a href="javascript:void(0)" class="js-tag color5">水桶问题</a>
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<a href="javascript:void(0)" class="js-tag color1">React</a>
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<a href="javascript:void(0)" class="js-tag color1">Hooks</a>
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<a href="javascript:void(0)" class="js-tag color4">CDN</a>
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<a href="javascript:void(0)" class="js-tag color1">intergrity</a>
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<a href="javascript:void(0)" class="js-tag color1">Shell</a>
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<a href="javascript:void(0)" class="js-tag color1">Spark</a>
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<a href="javascript:void(0)" class="js-tag color1">Scala</a>
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<a href="javascript:void(0)" class="js-tag color4">xss</a>
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<a href="javascript:void(0)" class="js-tag color5">csrf</a>
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<a href="javascript:void(0)" class="js-tag color4">GPU</a>
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<a href="javascript:void(0)" class="js-tag color4">DNS</a>
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<a href="javascript:void(0)" class="js-tag color3">HttpDNS</a>
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<a href="javascript:void(0)" class="js-tag color5">LDNS</a>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">Cache</a>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">重绘</a>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">回流</a>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color3">首屏</a>
</li>
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<a href="javascript:void(0)" class="js-tag color3">白屏</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">Yarn</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">defer</a>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color2">script</a>
</li>
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color5">call</a>
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<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">apply</a>
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<a href="javascript:void(0)" class="js-tag color1">emoji</a>
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