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<a class="post-title-link" href="/2019/10/11/about-vue3-proxy/" itemprop="url">浅析Vue3数据响应系统</a></h1>
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<p>国庆长假还没结束，尤大大就把Vue3源码给放了出来，还能不能好好让人好好放个假😨，目前的版本还是 <code>Pre-Alpha</code>，只是大概完成了核心的功能，还不太完整，源码地址：<a href="https://github.com/vuejs/vue-next" target="_blank" rel="noopener">Vue-next</a>， 而正式版本可能要明年才发布了，于是放假回来，便第一时间clone了源码，生啃了起来，还别说，真香~~~😂</p>
<p>源码整体结构还是比较清晰，相比较于Vue2.x做了比较大的调整，代码话说98%都是用ts编写，所以看源码还需要大概了解ts的一些知识。而在还没发布Vue3源码之前，官方也已经给出了 <a href="https://vue-composition-api-rfc.netlify.com/#basic-example" target="_blank" rel="noopener">Vue Composition API RFC</a>，可以初步了解Vue3的一些写法和特性，这两天花了些时间大概看了下数据响应部分（<a href="https://juejin.im/post/5d99d9a0f265da5b8601264c" target="_blank" rel="noopener">网上已经有大佬给出了调试技巧</a>）</p>
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<a class="post-title-link" href="/2019/07/03/about-mobile-develop/" itemprop="url">移动端开发问题小记</a></h1>
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2019-07-03
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<h2 id="关于ios键盘挡住问题-适用于input置底-键盘弹起窗口可滚动"><a class="header-anchor" href="#关于ios键盘挡住问题-适用于input置底-键盘弹起窗口可滚动"></a>关于ios键盘挡住问题（适用于input置底，键盘弹起窗口可滚动）</h2>
<figure class="highlight js"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 解决ios键盘被挡住input问题，适用于input置底，键盘弹起窗口可滚动</span></span><br><span class="line"><span class="comment"> * @param {*} input input类名或选择器</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> repairIosInputHidden(input) {</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">this</span>.isIos()) {</span><br><span class="line"> <span class="keyword">const</span> inputEl = <span class="keyword">typeof</span> input === <span class="string">'string'</span> ? <span class="built_in">document</span>.querySelector(input) : input;</span><br><span class="line"> <span class="keyword">let</span> timeout = <span class="literal">null</span>;</span><br><span class="line"> <span class="comment">// 记录窗口滚动前的滚动高度</span></span><br><span class="line"> <span class="keyword">const</span> scrollElement = <span class="built_in">document</span>.scrollingElement || <span class="built_in">document</span>.body || <span class="built_in">document</span>.documentElement;</span><br><span class="line"> <span class="keyword">const</span> bfscrolltop = scrollElement.scrollTop || <span class="built_in">window</span>.pageYOffset;</span><br><span class="line"> <span class="keyword">const</span> setScrollTop = <span class="function">(<span class="params">h</span>) =></span> {</span><br><span class="line"> scrollElement.scrollTop = h;</span><br><span class="line"> };</span><br><span class="line"> <span class="keyword">const</span> scrollToBottom = <span class="function"><span class="params">()</span> =></span> {</span><br><span class="line"> <span class="keyword">const</span> scrollHeight = <span class="built_in">document</span>.documentElement.scrollHeight || <span class="built_in">document</span>.body.scrollHeight;</span><br><span class="line"> setScrollTop(scrollHeight);</span><br><span class="line"> };</span><br><span class="line"> <span class="comment">// input聚焦键盘弹起，获取窗口可滚动高度scrollHeight，延时赋值，此时已经是最大可滚动高度了，</span></span><br><span class="line"> <span class="comment">// 即键盘弹出后滚动条会滚动到底部，input会显示在键盘之上</span></span><br><span class="line"> inputEl.onfocus = <span class="function"><span class="params">()</span> =></span> {</span><br><span class="line"> <span class="comment">// 让input显示在可视区域，兼容部分机型原生键盘挡住问题</span></span><br><span class="line"> inputEl.scrollIntoView(<span class="literal">true</span>);</span><br><span class="line"> timeout = setTimeout(<span class="function"><span class="params">()</span> =></span> {</span><br><span class="line"> scrollToBottom();</span><br><span class="line"> }, <span class="number">300</span>);</span><br><span class="line"> };</span><br><span class="line"> <span class="comment">// input失去焦点后，恢复原来滚动位置</span></span><br><span class="line"> inputEl.onblur = <span class="function"><span class="params">()</span> =></span> {</span><br><span class="line"> clearTimeout(timeout);</span><br><span class="line"> setScrollTop(bfscrolltop);</span><br><span class="line"> };</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
<h2 id="点击双击事件并存"><a class="header-anchor" href="#点击双击事件并存"></a>点击双击事件并存</h2>
<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><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><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</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">class</span>=<span class="string">"touch-wrapper"</span> @<span class="attr">click.stop</span>=<span class="string">"onTap"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">slot</span>></span><span class="tag"></<span class="name">slot</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 class="undefined"></span></span><br><span class="line"><span class="javascript"><span class="keyword">let</span> lastClickTime = <span class="number">0</span>;</span></span><br><span class="line"><span class="javascript"><span class="keyword">let</span> clickTimer;</span></span><br><span class="line"><span class="undefined"></span></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="javascript"> name: <span class="string">'BaseTouch'</span>,</span></span><br><span class="line"><span class="undefined"> props: {</span></span><br><span class="line"><span class="javascript"> <span class="comment">// 单击事件延迟时间</span></span></span><br><span class="line"><span class="undefined"> delay: {</span></span><br><span class="line"><span class="javascript"> type: <span class="built_in">Number</span>,</span></span><br><span class="line"><span class="javascript"> <span class="keyword">default</span>: <span class="number">300</span></span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"> },</span></span><br><span class="line"><span class="undefined"> methods: {</span></span><br><span class="line"><span class="undefined"> onTap(e) {</span></span><br><span class="line"><span class="javascript"> <span class="keyword">const</span> nowTime = <span class="keyword">new</span> <span class="built_in">Date</span>().getTime();</span></span><br><span class="line"><span class="javascript"> <span class="comment">// 在规定时间内再触发点击事件时执行doubleTap，即此时为双击事件，否则为单击事件</span></span></span><br><span class="line"><span class="javascript"> <span class="keyword">if</span> (nowTime - lastClickTime < <span class="keyword">this</span>.delay) {</span></span><br><span class="line"><span class="undefined"> lastClickTime = 0;</span></span><br><span class="line"><span class="javascript"> <span class="keyword">if</span> (clickTimer) {</span></span><br><span class="line"><span class="undefined"> clearTimeout(clickTimer);</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="javascript"> <span class="keyword">this</span>.$emit(<span class="string">'double-tap'</span>, e);</span></span><br><span class="line"><span class="javascript"> } <span class="keyword">else</span> {</span></span><br><span class="line"><span class="undefined"> lastClickTime = nowTime;</span></span><br><span class="line"><span class="javascript"> clickTimer = setTimeout(<span class="function"><span class="params">()</span> =></span> {</span></span><br><span class="line"><span class="javascript"> <span class="keyword">this</span>.$emit(<span class="string">'tap'</span>, e);</span></span><br><span class="line"><span class="javascript"> }, <span class="keyword">this</span>.delay);</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined"> }</span></span><br><span class="line"><span class="undefined">};</span></span><br><span class="line"><span class="undefined"></span><span class="tag"></<span class="name">script</span>></span></span><br></pre></td></tr></table></figure>
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<a class="post-title-link" href="/2019/02/26/about-promise/" itemprop="url">Promise原理小记</a></h1>
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<h1>定义</h1>
<p>Promise 对象用于表示一个异步操作的最终状态（完成或失败），以及其返回的值。</p>
<p><strong><em>Promise</em></strong>：为构造函数，接受一个函数作为参数，该函数接收resolve和reject两个参数，由JavaScript引擎提供，无需自己实现。</p>
<p><strong><em>resolve</em></strong>：其作用是将Promise对象的状态从Pending变为Resolved,在异步操作成功时调用，并将异步操作的结果，作为参数传递出去；</p>
<p><strong><em>reject</em></strong>：其作用是将Promise对象的状态从从Pending变为Rejected,在异步操作失败时调用，并将异步操作抛出的错误，作为参数传递出去。</p>
<p>Promise对象只有三种状态:</p>
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<li>未完成：pending</li>
<li>已完成：resolved(也称fulfilled)</li>
<li>失败：rejected</li>
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<h2 id="定义"><a class="header-anchor" href="#定义"></a>定义</h2>
<p><strong>async function</strong> 声明用于定义一个返回 <strong>AsyncFunction</strong> 对象的异步函数。异步函数是指通过事件循环异步执行的函数，它会通过一个隐式的 <strong>Promise</strong> 返回其结果。但是如果你的代码使用了异步函数，它的语法和结构会更像是标准的同步函数。</p>
<figure class="highlight js"><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></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">resolveAfter2Seconds</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">new</span> <span class="built_in">Promise</span>(<span class="function"><span class="params">resolve</span> =></span> {</span><br><span class="line"> setTimeout(<span class="function"><span class="params">()</span> =></span> {</span><br><span class="line"> resolve(<span class="string">'resolved'</span>);</span><br><span class="line"> }, <span class="number">2000</span>);</span><br><span class="line"> });</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">async</span> <span class="function"><span class="keyword">function</span> <span class="title">asyncCall</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="built_in">console</span>.log(<span class="string">'calling'</span>);</span><br><span class="line"> <span class="keyword">var</span> result = <span class="keyword">await</span> resolveAfter2Seconds();</span><br><span class="line"> <span class="built_in">console</span>.log(result);</span><br><span class="line"> <span class="comment">// expected output: 'resolved'</span></span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">asyncCall();</span><br><span class="line"></span><br><span class="line"><span class="comment">// calling</span></span><br><span class="line"><span class="comment">// resolved</span></span><br></pre></td></tr></table></figure>
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<a class="post-title-link" href="/2019/01/11/taro-music/" itemprop="url">🔥基于taro + dva + typescript 开发的音乐播放器小程序</a></h1>
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<h1>简介</h1>
<p>本项目是基于 <a href="https://github.com/NervJS/taro" target="_blank" rel="noopener">Taro</a> + <a href="https://dvajs.com/" target="_blank" rel="noopener">Dva</a> + <a href="https://www.tslang.cn/index.html" target="_blank" rel="noopener">TypeScript</a> 开发的音乐播放器小程序，是个人用于学习taro框架开发的，功能也相对简单，当然也存在一些不足，前期是用taro的redux版本开发，后面发现业务代码和页面耦合度高，就加入了dva，一个基于 <a href="https://github.com/reduxjs/redux" target="_blank" rel="noopener">redux</a> 和 <a href="https://github.com/redux-saga/redux-saga" target="_blank" rel="noopener">redux-saga</a> 的数据流方案，这里只用了dva的一个核心 <a href="https://github.com/dvajs/dva/tree/master/packages/dva-core" target="_blank" rel="noopener">dva-core</a>，用于model层来降低耦合，用 <a href="https://github.com/dvajs/dva-model-extend" target="_blank" rel="noopener">dva-model-extend</a> 复用 model，大大提升了开发体验，效果不错。后台是网易云音乐<a href="https://binaryify.github.io/NeteaseCloudMusicApi/#/" target="_blank" rel="noopener">NeteaseCloudMusicApi</a> 提供的API，目前该项目还没有正式上线到小程序。</p>
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