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id="doc-outline-aria-label" role="heading" data-v-1bb51deb>On this page</div><ul class="VPDocOutlineItem root" data-v-1bb51deb data-v-a59b5e7a><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-9e31b7f7></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-152d3a48><div class="content-container" data-v-152d3a48><!--[--><!--]--><main class="main" data-v-152d3a48><div style="position:relative;" class="vp-doc _article_%E6%B5%85%E6%9E%90defineProperty%E4%B8%8EProxy%E5%AE%9E%E7%8E%B0%E7%9A%84%E5%8F%8C%E5%90%91%E7%BB%91%E5%AE%9A" data-v-152d3a48><div><h1 id="浅析defineproperty与proxy实现的双向绑定" tabindex="-1">浅析defineProperty与Proxy实现的双向绑定 <a class="header-anchor" href="#浅析defineproperty与proxy实现的双向绑定" aria-label="Permalink to &quot;浅析defineProperty与Proxy实现的双向绑定&quot;"></a></h1><blockquote><p>文章内容总结自Vue官网 <a href="https://cn.vuejs.org/v2/guide/reactivity.html#%E5%A6%82%E4%BD%95%E8%BF%BD%E8%B8%AA%E5%8F%98%E5%8C%96" target="_blank" rel="noreferrer">深入响应式原理</a></p></blockquote><h2 id="🔰-vue2的响应式原理" tabindex="-1">🔰 Vue2的响应式原理 <a class="header-anchor" href="#🔰-vue2的响应式原理" aria-label="Permalink to &quot;🔰 Vue2的响应式原理&quot;"></a></h2><p><img src="https://v2.cn.vuejs.org/images/data.png" alt="image.png" loading="lazy"></p><blockquote><p>当你把一个普通的 JavaScript 对象传入 Vue 实例作为 <code>data</code> 选项Vue 将遍历此对象所有的 property并使用 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty" target="_blank" rel="noreferrer"><code>Object.defineProperty</code></a> 把这些 property 全部转为 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Working_with_Objects#%E5%AE%9A%E4%B9%89_getters_%E4%B8%8E_setters" target="_blank" rel="noreferrer">getter/setter</a></p><p>每个组件实例都对应一个 <strong>watcher</strong> 实例,它会在组件渲染的过程中把“接触”过的数据 property 记录为依赖。之后当依赖项的 setter 触发时,会通知 watcher从而使它关联的组件重新渲染。</p></blockquote><p>Vue2的响应式原理利用的是 <code>Object.defineProperty()</code><code>setter</code> 属性:</p><p><code>defineProperty()</code> 方法用于<strong>精确</strong>定义一个对象的属性,能够指定属性的各种特征,其中的 <code>set</code> 属性能够为对象指定一个 <code>setter</code> 函数,每次该属性的值发生修改,就会调用此函数。</p><blockquote><p>更多可以配置的属性请参看:<a href="https://juejin.cn/post/7088335075061792782" target="_blank" rel="noreferrer">什么是对象的数据属性描述符?存储属性描述符?</a></p></blockquote><p>这也是Vue2实现响应式数据、数据双向绑定的原理。</p><p>可以使用此方法实现一个简单的数据双向绑定的Demo</p><p><img src="https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f241135dbeb04e829fe6897c2e418aa2~tplv-k3u1fbpfcp-watermark.image?" alt="image.png" loading="lazy"></p><ul><li>输入框内的内容改变,<code>.vBox</code> 展示的文本会随之改变。</li><li>点击按钮修改 <code>vm.text</code>,输入框内的值和 <code>.vBox</code> 的文本都会发生改变。</li></ul><div class="language-html vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">html</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">body</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">input</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> type</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;text&quot;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> id</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;input&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> /&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> onclick</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">vm</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">.</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">text</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Hello, World.&#39;&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;Modify vm.text&lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> class</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;vBox&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;&lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">script</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 定义响应式数据</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> let</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> vm </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {}</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Object.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">defineProperty</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(vm, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;text&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, {</span></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> set</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: (</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">value</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 对象属性值被修改时setter函数被自动触发</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> document.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">querySelector</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;#input&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">).value </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> value</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> document.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">querySelector</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;.vBox&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">).innerHTML </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> value</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> },</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> })</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;"> // 监听输入行为</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> document.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">querySelector</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;#input&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">).</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">addEventListener</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;input&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, (</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">e</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> vm.text </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> e.target.value</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> })</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">script</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">body</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span></code></pre></div><p>通过 <code>defineProperty</code> 实现的响应式,<strong>不能检测</strong>数组和对象的变化:</p><p><strong>对于对象:</strong></p><p>Vue 无法检测 property 的添加或移除。</p><p>var vm = new Vue({ data:{ a:1 } }) // <code>vm.a</code> 是响应式的 vm.b = 2 // <code>vm.b</code> 是非响应式的</p><p><strong>对于数组:</strong></p><ol><li>当你利用索引直接设置一个数组项时,例如:<code>vm.items[indexOfItem] = newValue</code></li><li>当你修改数组的长度时,例如:<code>vm.items.length = newLength</code></li></ol><h2 id="🔰-vue3的响应式原理" tabindex="-1">🔰 Vue3的响应式原理 <a class="header-anchor" href="#🔰-vue3的响应式原理" aria-label="Permalink to &quot;🔰 Vue3的响应式原理&quot;"></a></h2></div></div></main><footer class="VPDocFooter" data-v-152d3a48 data-v-7dccd6b5><!--[--><!--]--><div class="edit-info" data-v-7dccd6b5><div class="edit-link" data-v-7dccd6b5><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/article/浅析defineProperty与Proxy实现的双向绑定.md" target="_blank" rel="noreferrer" data-v-7dccd6b5><!--[--><span class="vpi-square-pen edit-link-icon" data-v-7dccd6b5></span> Edit this page on GitHub<!--]--></a></div><div class="last-updated" data-v-7dccd6b5><p class="VPLastUpdated" data-v-7dccd6b5 data-v-a462baf3>Updated Date: <time datetime="2025-08-02T05:12:13.000Z" data-v-a462baf3></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-7dccd6b5><span class="visually-hidden" id="doc-footer-aria-label" data-v-7dccd6b5>Pager</span><div class="pager" data-v-7dccd6b5><a class="VPLink link pager-link prev" href="/article/%E5%BD%BB%E5%BA%95%E6%90%9E%E6%87%82%E5%AF%B9%E8%B1%A1%E7%9A%84%E6%95%B0%E6%8D%AE%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6%E3%80%81%E5%AD%98%E5%82%A8%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6.html" data-v-7dccd6b5><!--[--><span class="desc" data-v-7dccd6b5>Previous page</span><span class="title" data-v-7dccd6b5>彻底搞懂对象的数据属性描述符、存储属性描述符</span><!--]--></a></div><div class="pager" data-v-7dccd6b5><a class="VPLink link pager-link next" href="/article/%E6%B7%B1%E5%85%A5JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.html" data-v-7dccd6b5><!--[--><span class="desc" data-v-7dccd6b5>Next page</span><span class="title" data-v-7dccd6b5>深入JavaScript数据类型</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-fd6e12b1 data-v-f2508a02><div class="container" data-v-f2508a02><p class="message" data-v-f2508a02>Released under the MIT License.</p><p class="copyright" data-v-f2508a02>Copyright © 2022-PRESENT ZiuChen</p></div></footer><!--[--><!--]--></div></div>
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