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class="fa-fw fas fa-archive"></i><span> 归档</span></a></li><li><a class="site-page child" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></li><li><a class="site-page child" target="_blank" rel="noopener" href="https://buy.dreamlove.top/"><i class="fa-fw fas fa-heart"></i><span> 购物</span></a></li></ul></div></div><div id="toggle-menu"><a class="site-page" href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">vue当中script setup语法糖</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-09-11T19:18:21.000Z" title="发表于 2022-09-11 19:18:21">2022-09-11</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-09-11T19:18:21.000Z" title="更新于 2022-09-11 19:18:21">2022-09-11</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/HTML/">HTML</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/HTML/javscript/">javscript</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/HTML/javscript/typescript/">typescript</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.2k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>6分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" data-flag-title="vue当中script setup语法糖"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h2 id="前置"><a href="#前置" class="headerlink" title="前置"></a>前置</h2><ul><li>发现vue3的<code><script setup></code>很好用,就学习了下</li></ul><blockquote><p><a target="_blank" rel="noopener" href="https://cn.vuejs.org/guide/typescript/composition-api.html#typing-component-props">https://cn.vuejs.org/guide/typescript/composition-api.html#typing-component-props</a></p><p><a target="_blank" rel="noopener" href="https://cn.vuejs.org/api/sfc-script-setup.html">https://cn.vuejs.org/api/sfc-script-setup.html</a></p><p><a target="_blank" rel="noopener" href="https://blog.csdn.net/weixin_45203607/article/details/123130829">https://blog.csdn.net/weixin_45203607/article/details/123130829</a></p></blockquote><h3 id="Vue3-script-setup的作用"><a href="#Vue3-script-setup的作用" class="headerlink" title="Vue3-script-setup的作用"></a>Vue3-script-setup的作用</h3><h4 id="引入组件后可以不用手动去components当中手动在输入名称注册了-会自动注册组件"><a href="#引入组件后可以不用手动去components当中手动在输入名称注册了-会自动注册组件" class="headerlink" title="引入组件后可以不用手动去components当中手动在输入名称注册了,会自动注册组件"></a>引入组件后可以不用手动去components当中手动在输入名称注册了,会自动注册组件</h4><ul><li>之前的(需要引入并注册)</li></ul><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></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">UserInfo</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"></template></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">'./components/UserInfo.vue'</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">export</span> <span class="keyword">default</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">name</span>: <span class="string">"App"</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">components</span>:{</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title class_">UserInfo</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">},</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">setup</span>(<span class="params"></span>){</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> }</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">};</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br></pre></td></tr></table></figure><ul><li>之后的(使用了<code><script setup></code>)</li></ul><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></pre></td><td class="code"><pre><span class="line"><style scoped></style></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">UserInfo</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="comment">// This starter template is using Vue 3 <script setup> SFCs</span></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="comment">// Check out https://vuejs.org/api/sfc-script-setup.html#script-setup</span></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">"./components/UserInfo.vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"><span class="language-xml"></span></span><br></pre></td></tr></table></figure><h4 id="在setup或者data当中写好的数据可以不用return了"><a href="#在setup或者data当中写好的数据可以不用return了" class="headerlink" title="在setup或者data当中写好的数据可以不用return了"></a>在setup或者data当中写好的数据可以不用return了</h4><ul><li>之前的(需要return)</li></ul><figure class="highlight ts"><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></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">UserInfo</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line">{{name}}</span><br><span class="line"></template></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> { ref } <span class="keyword">from</span> <span class="string">'vue'</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">'./components/UserInfo.vue'</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">export</span> <span class="keyword">default</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">name</span>: <span class="string">"App"</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">components</span>:{</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title class_">UserInfo</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">},</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">setup</span>(<span class="params"></span>){</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">const</span> name = <span class="title function_">ref</span>(<span class="string">'梦洁小站'</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">return</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> name,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> }</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> }</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">};</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br></pre></td></tr></table></figure><ul><li>之后的(不需要return)</li></ul><figure class="highlight ts"><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"><style scoped></style></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">UserInfo</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"><span class="language-xml"> {{ name }}</span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> { ref } <span class="keyword">from</span> <span class="string">"vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">"./components/UserInfo.vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> name = <span class="title function_">ref</span>(<span class="string">"梦洁小站"</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br></pre></td></tr></table></figure><ul><li>等等等作用~</li></ul><h2 id="使用script-setup语法糖的时候要怎么使用props-emits呢"><a href="#使用script-setup语法糖的时候要怎么使用props-emits呢" class="headerlink" title="使用script setup语法糖的时候要怎么使用props,emits呢?"></a>使用script setup语法糖的时候要怎么使用props,emits呢?</h2><h3 id="defineProps-使用props接收数据"><a href="#defineProps-使用props接收数据" class="headerlink" title="defineProps-使用props接收数据"></a>defineProps-使用props接收数据</h3><ul><li>之前的使用(没有使用语法糖获取props的写法)</li></ul><p><strong>App.vue</strong></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><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">UserInfo</span> <span class="attr">:sex</span>=<span class="string">"sex"</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"></template></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> { ref } <span class="keyword">from</span> <span class="string">'vue'</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">'./components/UserInfo.vue'</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">export</span> <span class="keyword">default</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">name</span>: <span class="string">"App"</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">components</span>:{</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title class_">UserInfo</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">},</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">setup</span>(<span class="params"></span>){</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">const</span> name = <span class="title function_">ref</span>(<span class="string">'梦洁小站'</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">const</span> sex = <span class="title function_">ref</span>(<span class="string">'男-我是男孩子!'</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">return</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> name,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> sex,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> }</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> }</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">};</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br></pre></td></tr></table></figure><p><strong>UserInfo.vue</strong></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></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line">您好</span><br><span class="line"><p>性别:{{sex}}</p></span><br><span class="line"></template></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">export</span> <span class="keyword">default</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">name</span>: <span class="string">'UserInfo'</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">props</span>:{</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">sex</span>:<span class="title class_">String</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> },</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">setup</span>(<span class="params">props,{emit}</span>){</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">return</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">sex</span>:props.<span class="property">sex</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> }</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> }</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">}</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br></pre></td></tr></table></figure><ul><li>可以看到,还是比较麻烦的,接下来我们看下使用了<code><script setup></code>的写法吧</li></ul><p><strong>App.vue</strong></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></pre></td><td class="code"><pre><span class="line"><style scoped></style></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">UserInfo</span> <span class="attr">:sex</span>=<span class="string">"sex"</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> { ref } <span class="keyword">from</span> <span class="string">"vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">"./components/UserInfo.vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> name = <span class="title function_">ref</span>(<span class="string">"梦洁小站"</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> sex = <span class="title function_">ref</span>(<span class="string">"男-我是男孩子"</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure><p><strong>UserInfo.vue</strong></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></pre></td><td class="code"><pre><span class="line"><style scoped></span><br><span class="line"></span><br><span class="line"></style></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml">你好</span></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">p</span>></span>性别:{{sex}}<span class="tag"></<span class="name">p</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> props = <span class="title function_">defineProps</span>({</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">sex</span>:<span class="title class_">String</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">})</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br></pre></td></tr></table></figure><h3 id="defineEmits-使用emit触发自定义事件"><a href="#defineEmits-使用emit触发自定义事件" class="headerlink" title="defineEmits-使用emit触发自定义事件"></a>defineEmits-使用emit触发自定义事件</h3><ul><li>之前的emit写法</li></ul><p><strong>App.vue</strong></p><figure class="highlight ts"><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></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">UserInfo</span> @<span class="attr">sayHello</span>=<span class="string">"sayHello"</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"></template></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">"./components/UserInfo.vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">export</span> <span class="keyword">default</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">name</span>: <span class="string">"App"</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">components</span>: {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title class_">UserInfo</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> },</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">setup</span>(<span class="params"></span>) {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">const</span> <span class="title function_">sayHello</span> = (<span class="params">value</span>) => {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"我会说sayHello哦"</span>, value);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> };</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">return</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> sayHello,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> };</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> },</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">};</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">style</span> <span class="attr">scoped</span>></span><span class="tag"></<span class="name">style</span>></span></span></span><br></pre></td></tr></table></figure><p><strong>UserInfo.vue</strong></p><figure class="highlight ts"><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></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">button</span> @<span class="attr">click</span>=<span class="string">"handleClick"</span>></span>单击我-userInfo<span class="tag"></<span class="name">button</span>></span></span></span><br><span class="line"></template></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">export</span> <span class="keyword">default</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">name</span>: <span class="string">"UserInfo"</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">emits</span>:[<span class="string">'sayHello'</span>],</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">setup</span>(<span class="params">props, { emit }</span>) {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">const</span> <span class="title function_">handleClick</span> = (<span class="params"></span>) => {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"111"</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">emit</span>(<span class="string">"sayHello"</span>, <span class="string">"我是UserInfo传的消息"</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> };</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="keyword">return</span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> handleClick,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> };</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> },</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">};</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">style</span> <span class="attr">scoped</span>></span><span class="tag"></<span class="name">style</span>></span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure><ul><li>使用了<code><script setup>语法糖的写法</code></li></ul><p><strong>App.vue</strong></p><figure class="highlight ts"><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"><style scoped></style></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">UserInfo</span> @<span class="attr">sayHello</span>=<span class="string">"sayHello"</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">"./components/UserInfo.vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> sayHello = (<span class="attr">value</span>: string): <span class="function"><span class="params">void</span> =></span> {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"我会说sayHello哦"</span>, value);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">};</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure><p><strong>UserInfo.vue</strong></p><figure class="highlight ts"><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></pre></td><td class="code"><pre><span class="line"><style scoped></style></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">button</span> @<span class="attr">click</span>=<span class="string">"handleClick"</span>></span>单击我-userInfo<span class="tag"></<span class="name">button</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> emit = <span class="title function_">defineEmits</span>([<span class="string">"sayHello"</span>]);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> <span class="title function_">handleClick</span> = (<span class="params"></span>) => {</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="title function_">emit</span>(<span class="string">"sayHello"</span>, <span class="string">"我是UserInfo传的消息"</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">};</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure><h3 id="使用顶层-await结果代码会被编译成-async-setup"><a href="#使用顶层-await结果代码会被编译成-async-setup" class="headerlink" title="使用顶层 await结果代码会被编译成 async setup()"></a>使用顶层 await结果代码会被编译成 async setup()</h3><p><strong>App.vue</strong></p><figure class="highlight ts"><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"><style scoped></style></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">Suspense</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">UserInfo</span>></span><span class="tag"></<span class="name">UserInfo</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">Suspense</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> <span class="title class_">UserInfo</span> <span class="keyword">from</span> <span class="string">"./components/UserInfo.vue"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure><ul><li><code>async setup()</code> 必须与 <a target="_blank" rel="noopener" href="https://cn.vuejs.org/guide/built-ins/suspense.html"><code>Suspense</code> 内置组件</a>组合使用，<code>Suspense</code> 目前还是处于实验阶段的特性，会在将来的版本中稳定</li></ul><p><strong>UserInfo.vue</strong></p><figure class="highlight ts"><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></pre></td><td class="code"><pre><span class="line"><style scoped></style></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"></<span class="name">template</span>></span></span></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">setup</span> <span class="attr">lang</span>=<span class="string">"ts"</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> axios <span class="keyword">from</span> <span class="string">"axios"</span>;</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="comment">//请求数据</span></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> data = <span class="keyword">await</span> <span class="title function_">axios</span>(<span class="string">"https://api.oick.cn/lishi/api.php"</span>);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="variable language_">console</span>.<span class="title function_">log</span>(data);</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure><h2 id="注意点"><a href="#注意点" class="headerlink" title="注意点"></a>注意点</h2><ul><li>如果在vue中使用ts,那么引入组件的时候,最好加上去,<strong>否者可能会导致报错!!</strong></li></ul><p><strong>正确的</strong></p><figure class="highlight ts"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> <span class="title class_">UserInfoVue</span> <span class="keyword">from</span> <span class="string">'./components/UserInfo.vue'</span>;</span><br></pre></td></tr></table></figure><p><strong>错误的</strong></p><p>错误提示:找不到模块“./components/UserInfo”或其相应的类型声明。ts(2307)</p><figure class="highlight ts"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> <span class="title class_">UserInfoVue</span> <span class="keyword">from</span> <span class="string">'./components/UserInfo'</span>;</span><br></pre></td></tr></table></figure><p><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/202209111711068.png"></p></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta"><i class="fas fa-circle-user fa-fw"></i>文章作者: </span><span class="post-copyright-info"><a href="https://www.dreamlove.top">梦洁</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta"><i class="fas fa-square-arrow-up-right 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class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">不断更新中,有问题请留言回复(会通过邮箱提醒~)</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%89%8D%E7%BD%AE"><span class="toc-number">1.</span> <span class="toc-text">前置</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Vue3-script-setup%E7%9A%84%E4%BD%9C%E7%94%A8"><span class="toc-number">1.1.</span> <span class="toc-text">Vue3-script-setup的作用</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%BC%95%E5%85%A5%E7%BB%84%E4%BB%B6%E5%90%8E%E5%8F%AF%E4%BB%A5%E4%B8%8D%E7%94%A8%E6%89%8B%E5%8A%A8%E5%8E%BBcomponents%E5%BD%93%E4%B8%AD%E6%89%8B%E5%8A%A8%E5%9C%A8%E8%BE%93%E5%85%A5%E5%90%8D%E7%A7%B0%E6%B3%A8%E5%86%8C%E4%BA%86-%E4%BC%9A%E8%87%AA%E5%8A%A8%E6%B3%A8%E5%86%8C%E7%BB%84%E4%BB%B6"><span class="toc-number">1.1.1.</span> <span class="toc-text">引入组件后可以不用手动去components当中手动在输入名称注册了,会自动注册组件</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%9C%A8setup%E6%88%96%E8%80%85data%E5%BD%93%E4%B8%AD%E5%86%99%E5%A5%BD%E7%9A%84%E6%95%B0%E6%8D%AE%E5%8F%AF%E4%BB%A5%E4%B8%8D%E7%94%A8return%E4%BA%86"><span class="toc-number">1.1.2.</span> <span class="toc-text">在setup或者data当中写好的数据可以不用return了</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BD%BF%E7%94%A8script-setup%E8%AF%AD%E6%B3%95%E7%B3%96%E7%9A%84%E6%97%B6%E5%80%99%E8%A6%81%E6%80%8E%E4%B9%88%E4%BD%BF%E7%94%A8props-emits%E5%91%A2"><span class="toc-number">2.</span> <span class="toc-text">使用script setup语法糖的时候要怎么使用props,emits呢?</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#defineProps-%E4%BD%BF%E7%94%A8props%E6%8E%A5%E6%94%B6%E6%95%B0%E6%8D%AE"><span class="toc-number">2.1.</span> <span class="toc-text">defineProps-使用props接收数据</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#defineEmits-%E4%BD%BF%E7%94%A8emit%E8%A7%A6%E5%8F%91%E8%87%AA%E5%AE%9A%E4%B9%89%E4%BA%8B%E4%BB%B6"><span class="toc-number">2.2.</span> <span class="toc-text">defineEmits-使用emit触发自定义事件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%BD%BF%E7%94%A8%E9%A1%B6%E5%B1%82-await%E7%BB%93%E6%9E%9C%E4%BB%A3%E7%A0%81%E4%BC%9A%E8%A2%AB%E7%BC%96%E8%AF%91%E6%88%90-async-setup"><span class="toc-number">2.3.</span> <span class="toc-text">使用顶层 await结果代码会被编译成 async setup()</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%B3%A8%E6%84%8F%E7%82%B9"><span class="toc-number">3.</span> <span class="toc-text">注意点</span></a></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/bbed5cd2.html" title="大家好我是夯大力,这是我的影视,大力金刚等系列"><img src="https://dreamos.oss-cn-beijing.aliyuncs.com/gitblog/202410091600476.png" onerror='this.onerror=null,this.src="/img/404.png"' alt="大家好我是夯大力,这是我的影视,大力金刚等系列"></a><div class="content"><a class="title" href="/bbed5cd2.html" title="大家好我是夯大力,这是我的影视,大力金刚等系列">大家好我是夯大力,这是我的影视,大力金刚等系列</a><time datetime="2024-10-21T08:12:21.000Z" title="发表于 2024-10-21 08:12:21">2024-10-21</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/91ff580f.html" title="Pycharm搭配miniConda(Anaconda的轻量版本)建立虚拟环境管理不同项目不同依赖">Pycharm搭配miniConda(Anaconda的轻量版本)建立虚拟环境管理不同项目不同依赖</a><time 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