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+---
+title: ResizeObserverEntry
+slug: Web/API/ResizeObserverEntry
+translation_of: Web/API/ResizeObserverEntry
+---
+<div>{{APIRef("Resize Observer API")}}{{SeeCompatTable}}</div>
+
+<p class="summary"><strong><code>ResizeObserverEntry</code></strong> 接口是传递给{{domxref('ResizeObserver.ResizeObserver','ResizeObserver()')}} 构造器回调函数中的参数对象。</p>
+
+<h2 id="属性">属性</h2>
+
+<dl>
+ <dt>{{domxref('ResizeObserverEntry.contentRect')}} {{experimental_inline}} {{readonlyinline}}</dt>
+ <dd>对改变尺寸大小的元素的 {{domxref('DOMRectReadOnly')}}引用（包含x,y,width,height,top,right,bottom,left属性）。</dd>
+ <dt>{{domxref('ResizeObserverEntry.target')}} {{experimental_inline}} {{readonlyinline}}</dt>
+ <dd>当前改变尺寸大小的元素的 {{domxref('Element')}} 引用</dd>
+ <dt> </dt>
+</dl>
+
+<h3 id="事件">事件</h3>
+
+<p>无</p>
+
+<h2 id="方法">方法</h2>
+
+<p>无.</p>
+
+<h2 id="示例">示例</h2>
+
+<p>以下示例通过观察box的宽度变化从而改变其边框圆角半径。</p>
+
+<pre class="brush: js">const resizeOserver = 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','#resize-observer-entry-interface','ResizeObserverEntry')}}</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.ResizeObserverEntry")}}</p>