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+---
+title: ResizeObserver.observe()
+slug: Web/API/ResizeObserver/observe
+translation_of: Web/API/ResizeObserver/observe
+---
+<div>{{APIRef("Resize Observer API")}}{{SeeCompatTable}}</div>
+
+<p class="summary">The <strong><code>observe()</code></strong> method of the {{domxref("ResizeObserver")}} interface initiates observing of a specified {{domxref('Element')}} or {{domxref('SVGElement')}}.<br>
+ {{domxref("ResizeObserver")}} 接口的 <strong><code>observe()</code> </strong>方法用于观察一个指定{{domxref('Element')}} 或 {{domxref('SVGElement')}}。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>resizeObserver</em>.observe(<em>target</em>);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>target</dt>
+ <dd>被观察的 {{domxref('Element')}} 或 {{domxref('SVGElement')}} 引用。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>{{jsxref('undefined')}}</p>
+
+<h3 id="异常">异常</h3>
+
+<p>无</p>
+
+<h2 id="示例">示例</h2>
+
+<p>以下示例通过观察box的尺寸变化从而改变其边框圆角半径。</p>
+
+<pre class="brush: js">const resizeObserver = new ResizeObserver(entries =&gt; {
+  for (let entry of entries) {
+    entry.target.style.borderRadius = Math.max(0, 250 - entry.contentRect.width) + 'px';
+  }
+});
+resizeObserver.observe(document.querySelector('.box:nth-child(2)'));</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Resize Observer','#dom-resizeobserver-observe','observe()')}}</td>
+   <td>{{Spec2('Resize Observer')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.ResizeObserver.observe")}}</p>