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href="/blog/pages/07b384c2e6232e07/" aria-current="page" class="active sidebar-link">父组件给子组件传值</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/07b384c2e6232e07/#单向数据流" class="sidebar-link">单向数据流</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/07b384c2e6232e07/#父子组件间传递数据-demo" class="sidebar-link">父子组件间传递数据 demo</a></li></ul></li><li><a href="/blog/pages/0f19a1bcac14fd41/" class="sidebar-link">子组件派发事件和值给父组件</a></li><li><a href="/blog/pages/a3080f60f6596eb4/" class="sidebar-link">Prop 验证 与 非 Prop 的 Attribute</a></li><li><a href="/blog/pages/9651417d08d1779d/" class="sidebar-link">自定义事件</a></li><li><a href="/blog/pages/809f4582d9ca9552/" class="sidebar-link">兄弟组件传值</a></li><li><a href="/blog/pages/d408e64f666f146d/" class="sidebar-link">非父子组件传值</a></li><li><a href="/blog/pages/2e24dab728769e0c/" class="sidebar-link">父组件调用子组件方法并传入值</a></li><li><a href="/blog/pages/055ecee9a4325386/" class="sidebar-link">插槽slot</a></li><li><a href="/blog/pages/636ca33122e9a64b/" class="sidebar-link">动态组件与 v-once 指令</a></li><li><a href="/blog/pages/e6cec47efa42d7f1/" class="sidebar-link">vue父子组件的生命周期顺序</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>过渡&动画</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>可复用性&组合</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>规模化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Vuex</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>其他</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06970110><div class="articleInfo" data-v-06970110><ul class="breadcrumbs" data-v-06970110><li data-v-06970110><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06970110></a></li> <li data-v-06970110><a href="/blog/note/vue/#《Vue》笔记" data-v-06970110>《Vue》笔记</a></li><li data-v-06970110><a href="/blog/note/vue/#组件" data-v-06970110>组件</a></li></ul> <div class="info" data-v-06970110><div title="作者" class="author iconfont icon-touxiang" data-v-06970110><a href="https://github.com/heBody" target="_blank" title="作者" class="beLink" data-v-06970110>heBody</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06970110><a href="javascript:;" data-v-06970110>2020-02-04</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">父组件给子组件传值<!----></h1> <div class="theme-vdoing-content content__default"><h1 id="父组件给子组件传值"><a href="#父组件给子组件传值" class="header-anchor">#</a> 父组件给子组件传值</h1> <p>父组件中，通过给子组件标签v-bind绑定属性的方式传入值</p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ComponentName</span> <span class="token attr-name"><span class="token namespace">v-bind:</span>name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>value<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ComponentName</span><span class="token punctuation">></span></span>
- </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><blockquote><p>如果不使用v-bind传入的值为字符串，使用v-bind绑定传入的值为表达式。
- 子组件中，通过props对象接收值</p></blockquote> <div class="language-js line-numbers-mode"><pre class="language-js"><code> <span class="token literal-property property">props</span><span class="token operator">:</span> <span class="token punctuation">{</span>
- <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token comment">// 接收父组件传入值</span>
- <span class="token literal-property property">type</span><span class="token operator">:</span> String <span class="token operator">||</span> <span class="token operator">...</span><span class="token punctuation">,</span>
- <span class="token keyword">default</span><span class="token operator">:</span> <span class="token string">''</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="单向数据流"><a href="#单向数据流" class="header-anchor">#</a> 单向数据流</h2> <p>所有的 prop 都使得其父子 prop 之间形成了一个单向下行绑定：父级 prop 的更新会向下流动到子组件中，但是反过来则不行。这样会防止从子组件意外改变父级组件的状态，从而导致你的应用的数据流向难以理解。</p> <p><strong>子组件不能直接修改父组件传入的值</strong></p> <p>这里有两种常见的试图改变一个 prop 的情形：</p> <ol><li>这个 prop 用来传递一个初始值；这个子组件接下来希望将其作为一个本地的 prop 数据来使用。在这种情况下，最好定义一个本地的 data 属性并将这个 prop 用作其初始值：</li></ol> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token literal-property property">props</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'initialCounter'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
- <span class="token function-variable function">data</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> <span class="token punctuation">{</span>
- <span class="token literal-property property">counter</span><span class="token operator">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>initialCounter
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ol start="2"><li>这个 prop 以一种原始的值传入且需要进行转换。在这种情况下，最好使用这个 prop 的值来定义一个计算属性：</li></ol> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token literal-property property">props</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'size'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
- <span class="token literal-property property">computed</span><span class="token operator">:</span> <span class="token punctuation">{</span>
- <span class="token function-variable function">normalizedSize</span><span class="token operator">:</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
- <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>size<span class="token punctuation">.</span><span class="token function">trim</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
- <span class="token punctuation">}</span>
- <span class="token punctuation">}</span>
- </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="父子组件间传递数据-demo"><a href="#父子组件间传递数据-demo" class="header-anchor">#</a> 父子组件间传递数据 demo</h2> <p data-height="400" data-theme-id="light" data-default-tab="js,result" data-user="heBody" data-slug-hash="mdJVqgg" data-pen-title="mdJVqgg" class="codepen" style="height:400px;box-sizing:border-box;display:flex;align-items:center;justify-content:center;border:2px solid;margin:1em 0;padding:1em;"><span>See the Pen <a href="https://codepen.io/heBody/pen/mdJVqgg">
- mdJVqgg</a> by heBody (<a href="https://codepen.io/heBody">@heBody</a>)
- on <a href="https://codepen.io">CodePen</a>.</span></p> <script async="async" src="https://static.codepen.io/assets/embed/ei.js"></script></div></div> <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/《Vue》笔记/02.组件/40.父组件给子组件传值.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="tags"><a href="/blog/tags/?tag=Vue" title="标签">#Vue</a></div> <div class="last-updated"><span class="prefix">上次更新:</span> <span class="time">2022/12/14, 19:36:42</span></div></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/blog/pages/83a1ab785e7fd70c/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">使用组件的细节点</div></a> <a href="/blog/pages/0f19a1bcac14fd41/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">子组件派发事件和值给父组件</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
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