---
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 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','#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>