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<h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a><strong>前言</strong></h1><p><br> </p>
<blockquote>
<p><strong>uni-app是hbuilder公司开发的新产品，实现使用vue的语法开发的代码，可以编译到H5、小程序、APP等多端，但是坑也很多，请大家避免。</strong></p>
</blockquote>
<h2 id="Uni-app那些坑"><a href="#Uni-app那些坑" class="headerlink" title="Uni-app那些坑"></a>Uni-app那些坑</h2><h2 id="1-软件的坑"><a href="#1-软件的坑" class="headerlink" title="[1]软件的坑"></a>[1]软件的坑</h2><hr>
<p><strong>1.运行的时候动不动要重启</strong><br><strong>2.修改代码后不要等自动编译，尤其是小程序和app，先点击停止，再重新运行</strong></p>
<h2 id="2-代码的坑"><a href="#2-代码的坑" class="headerlink" title="[2]代码的坑"></a>[2]代码的坑</h2><hr>
<h3 id="一-模板中的坑"><a href="#一-模板中的坑" class="headerlink" title="一.模板中的坑"></a>一.模板中的坑</h3><blockquote>
<p>说明使用vue模板开发的坑</p>
</blockquote>
<h4 id="1-v-for坑多"><a href="#1-v-for坑多" class="headerlink" title="1. v-for坑多"></a>1. v-for坑多</h4><ul>
<li>关键字不能使用index,否则无法编译通过</li>
</ul>
<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></pre></td><td class="code"><pre><span class="line">错误案例</span><br><span class="line"><span class="tag"><<span class="name">view</span> <span class="attr">v-for</span>=<span class="string">"index in 6"</span> <span class="attr">:key</span>=<span class="string">" index"</span>></span></span><br><span class="line"><span class="tag"></<span class="name">view</span>></span></span><br><span class="line">正确案例，避免使用index</span><br><span class="line"><span class="tag"><<span class="name">view</span> <span class="attr">v-for</span>=<span class="string">"i in 6"</span> <span class="attr">:key</span>=<span class="string">"i"</span>></span></span><br><span class="line"><span class="tag"></<span class="name">view</span>></span></span><br></pre></td></tr></table></figure>
<ul>
<li>:key不能拼接字符串，否则原生(小程序)编译无法通过</li>
</ul>
<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></pre></td><td class="code"><pre><span class="line">错误案例</span><br><span class="line"><span class="tag"><<span class="name">view</span> <span class="attr">v-for</span>=<span class="string">"i in 6"</span> <span class="attr">:key</span>=<span class="string">" 'item'+i"</span>></span></span><br><span class="line"><span class="tag"></<span class="name">view</span>></span></span><br><span class="line">正确案例，避免使用拼接</span><br><span class="line"><span class="tag"><<span class="name">view</span> <span class="attr">v-for</span>=<span class="string">"i in 6"</span> <span class="attr">:key</span>=<span class="string">"i"</span>></span></span><br><span class="line"><span class="tag"></<span class="name">view</span>></span></span><br></pre></td></tr></table></figure>
<ul>
<li>v-for 禁止循环数字，如果有需要,请封装对象循环</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">小程序、APP、 H5循环无法保持统- -, H5从<span class="number">1</span>开始循环, 小程序和APP从开始循环，太坑了，需要把循环主体改成对象去循环</span><br></pre></td></tr></table></figure>
<ul>
<li><strong>组件如果使用了slot,那调用的时候slot不能使用v-for ,仅H5支持，其他均不支持</strong><br><br></li>
</ul>
<h4 id="2-过滤器计算属性的坑"><a href="#2-过滤器计算属性的坑" class="headerlink" title="2. 过滤器计算属性的坑"></a>2. 过滤器计算属性的坑</h4><p><strong>不支持部分复杂的 JavaScript 渲染表达式和过滤器</strong><br><strong>目前可以使用的有 <code>+ - * % ?: ! == === > < [] .</code>。</strong></p>
<p><strong>解决办法：在数据遍历回来的时候提前用<code>computed</code>计算属性</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></pre></td><td class="code"><pre><span class="line">uni.request({</span><br><span class="line"> url: <span class="string">'http://localhost:3000/apiList'</span>, <span class="comment">//仅为示例，并非真实接口地址。</span></span><br><span class="line"> success: <span class="function">(<span class="params">res</span>) =></span> {</span><br><span class="line"> <span class="keyword">this</span>.apiList = res.data</span><br><span class="line"> <span class="keyword">this</span>.apiList.forEach(<span class="function"><span class="params">item</span> =></span> item.date = <span class="keyword">this</span>.formatTime(item.date))</span><br><span class="line"> }</span><br><span class="line"> })</span><br></pre></td></tr></table></figure>
<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></pre></td><td class="code"><pre><span class="line"><span class="comment"><!-- 这种就不支持，建议写 computed --></span></span><br><span class="line"><span class="tag"><<span class="name">view</span>></span>{{ message.split('').reverse().join('') }}<span class="tag"></<span class="name">view</span>></span></span><br><span class="line"></span><br><span class="line"><span class="comment"><!-- 但写在 @event 里面的表达式是都支持的，因为这部分的计算放在了 vdom 里面 --></span></span><br><span class="line"><span class="tag"><<span class="name">view</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">view</span> <span class="attr">v-for</span>=<span class="string">"(item, index) in list"</span> <span class="attr">:key</span>=<span class="string">"index"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">view</span> @<span class="attr">click</span>=<span class="string">"clickHandle(item, index, $event)"</span>></span>{{ item.value }}<span class="tag"></<span class="name">view</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">view</span>></span></span><br><span class="line"><span class="tag"></<span class="name">view</span>></span></span><br></pre></td></tr></table></figure>
<h3 id="二、JS中的坑"><a href="#二、JS中的坑" class="headerlink" title="二、JS中的坑"></a>二、JS中的坑</h3><p><strong>1.组件不能使用onReady、onLoad等方法，请使用vue的mounted和created</strong></p>
<h4 id="2-uni-app中vuex使用的区别"><a href="#2-uni-app中vuex使用的区别" class="headerlink" title="2: uni-app中vuex使用的区别"></a>2: uni-app中vuex使用的区别</h4><blockquote>
<p>uni-app中this.$store为undefind ,必须要在main.js中加入这行代码</p>
</blockquote>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Vue.prototype.$store = store</span><br></pre></td></tr></table></figure>
<h3 id="三、css中-的坑"><a href="#三、css中-的坑" class="headerlink" title="三、css中 的坑"></a>三、css中 的坑</h3><p><strong>在APP.vue中page 可以设置全局页面的样式,如果想在当个页面覆盖的话,直接另起一个style 加入page便可覆盖</strong></p>
<h3 id="四、注意事项"><a href="#四、注意事项" class="headerlink" title="四、注意事项"></a>四、注意事项</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">- 非<span class="string">`H5`</span> 端，不能使用浏览器自带对象，比如 <span class="built_in">document</span>、<span class="built_in">window</span>、localstorage、cookie 等，更不能使用 jquery 等依赖这些浏览器对象的框架。因为各家小程序快应用都不支持这些对象。没有这些浏览器自带对象并不影响业务开发，uni 提供的 api 足够完成业务。</span><br></pre></td></tr></table></figure>
<h3 id="五、-一些小tips"><a href="#五、-一些小tips" class="headerlink" title="五、 一些小tips"></a>五、 一些小<code>tips</code></h3><h4 id="可自定义图标"><a href="#可自定义图标" class="headerlink" title="可自定义图标"></a>可自定义图标</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">官方提供的icon图标太少,可以去阿里矢量图那边自定义自己想要的icon</span><br></pre></td></tr></table></figure>
<h3 id="条件编译"><a href="#条件编译" class="headerlink" title="条件编译"></a>条件编译</h3><blockquote>
<p>在 C 语言中，通过 #ifdef、#ifndef 的方式，为 windows、mac 等不同 os 编译不同的代码 uni-app 参考这个思路，为 uni-app 提供了条件编译手段，在一个工程里优雅的完成了平台个性化实现 。<br>条件编译是利用注释实现的，在不同语法里注释写法不一样，js使用 // 注释、css 使用 /<em> 注释 </em>/。</p>
</blockquote>
<p>举个栗子:<br><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></pre></td><td class="code"><pre><span class="line"><span class="comment">// #ifdef %PLATFORM%</span></span><br><span class="line">平台特有的API实现</span><br><span class="line"><span class="comment">// #endif</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">// #ifndef H5</span></span><br><span class="line"><span class="comment">// 表示只有 h5 不使用这个 api</span></span><br><span class="line">uni.createAnimation(OBJECT)</span><br><span class="line"><span class="comment">// #endif</span></span><br></pre></td></tr></table></figure></p>
<figure class="highlight"><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></pre></td><td class="code"><pre><span class="line"><!-- #ifdef %PLATFORM% --></span><br><span class="line">平台特有的组件</span><br><span class="line"><!-- #endif --></span><br><span class="line"></span><br><span class="line"><!-- #ifdef MP-WEIXIN --></span><br><span class="line"><!-- 只在小程序中生效 --></span><br><span class="line"><view> 我是微信小程序 <<span class="regexp">/view></span></span><br><span class="line"><span class="regexp"><!-- #endif --></span></span><br><span class="line"><span class="regexp"></span></span><br><span class="line"><span class="regexp"><!-- #ifdef APP-PLUS --></span></span><br><span class="line"><span class="regexp"><!-- 只在 app 中生效 --></span></span><br><span class="line"><span class="regexp"><view> 我是 app </</span>view></span><br><span class="line"><!-- #endif --></span><br></pre></td></tr></table></figure>
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<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#前言"><span class="nav-number">1.</span> <span class="nav-text">前言</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#Uni-app那些坑"><span class="nav-number">1.1.</span> <span class="nav-text">Uni-app那些坑</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#1-软件的坑"><span class="nav-number">1.2.</span> <span class="nav-text">[1]软件的坑</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#2-代码的坑"><span class="nav-number">1.3.</span> <span class="nav-text">[2]代码的坑</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#一-模板中的坑"><span class="nav-number">1.3.1.</span> <span class="nav-text">一.模板中的坑</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#1-v-for坑多"><span class="nav-number">1.3.1.1.</span> <span class="nav-text">1. v-for坑多</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#2-过滤器计算属性的坑"><span class="nav-number">1.3.1.2.</span> <span class="nav-text">2. 过滤器计算属性的坑</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#二、JS中的坑"><span class="nav-number">1.3.2.</span> <span class="nav-text">二、JS中的坑</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#2-uni-app中vuex使用的区别"><span class="nav-number">1.3.2.1.</span> <span class="nav-text">2: uni-app中vuex使用的区别</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#三、css中-的坑"><span class="nav-number">1.3.3.</span> <span class="nav-text">三、css中 的坑</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#四、注意事项"><span class="nav-number">1.3.4.</span> <span class="nav-text">四、注意事项</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#五、-一些小tips"><span class="nav-number">1.3.5.</span> <span class="nav-text">五、 一些小tips</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#可自定义图标"><span class="nav-number">1.3.5.1.</span> <span class="nav-text">可自定义图标</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#条件编译"><span class="nav-number">1.3.6.</span> <span class="nav-text">条件编译</span></a></li></ol></li></ol></li></ol></div>
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