在此页

• 特性
• 方法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

ResizeObserverEntry interface represents the object passed to the ResizeObserver() constructor's callback function, which allows you to access the new dimensions of the 元素 or SVGElement being observed.

特性

ResizeObserverEntry.borderBoxSize 只读

An object containing the new border box size of the observed element when the callback is run.

ResizeObserverEntry.contentBoxSize 只读

An object containing the new content box size of the observed element when the callback is run.

ResizeObserverEntry.contentRect 只读

DOMRectReadOnly object containing the new size of the observed element when the callback is run. Note that this is better supported than the above two properties, but it is left over from an earlier implementation of the Resize Observer API, is still included in the spec for web compat reasons, and may be deprecated in future versions.

ResizeObserverEntry.target 只读

A reference to the 元素 or SVGElement being observed.

注意 : The content box is the box in which content can be placed, meaning the border box minus the padding and border width. The border box encompasses the content, padding, and border. See The box model for further explanation.

方法

None.

范例

The following snippet is taken from the resize-observer-text.html ( see source ) example. This uses a simple feature detection test to see if the browser supports the newer contentBoxSize property — if so, it uses that to get the sizing data it needs. If not, it uses the older contentRect 特性。

const resizeObserver = new ResizeObserver(entries => {
  for (let entry of entries) {
    if(entry.contentBoxSize) {
      h1Elem.style.fontSize = Math.max(1.5, entry.contentBoxSize.inlineSize/200) + 'rem';
      pElem.style.fontSize = Math.max(1, entry.contentBoxSize.inlineSize/600) + 'rem';
    } else {
      h1Elem.style.fontSize = Math.max(1.5, entry.contentRect.width/200) + 'rem';
      pElem.style.fontSize = Math.max(1, entry.contentRect.width/600) + 'rem';
    }
  }
});
resizeObserver.observe(divElem);
					

规范

规范	状态	注释
重置大小观测器 The definition of 'ResizeObserverEntry' in that specification.	编者草案	初始定义。

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
ResizeObserverEntry	Chrome 64	Edge 79	Firefox 69	IE No	Opera Yes	Safari No	WebView Android 64	Chrome Android 64	Firefox Android No	Opera Android Yes	Safari iOS No	Samsung Internet Android 9.0
borderBoxSize	Chrome No	Edge No	Firefox 69	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android No
contentBoxSize	Chrome No	Edge No	Firefox 69	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android No
contentRect	Chrome 64	Edge 79	Firefox 69	IE No	Opera Yes	Safari No	WebView Android 64	Chrome Android 64	Firefox Android No	Opera Android Yes	Safari iOS No	Samsung Internet Android 9.0
target	Chrome 64	Edge 79	Firefox 69	IE No	Opera Yes	Safari No	WebView Android 64	Chrome Android 64	Firefox Android No	Opera Android Yes	Safari iOS No	Samsung Internet Android 9.0

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

元数据

• 最后修改： Aug 29, 2019

相关话题

1. 重置尺寸观测器 API
2. ResizeObserverEntry
3. 特性

   1. borderBoxSize
   2. contentBoxSize
   3. contentRect
   4. target
4. Related pages for Resize Observer API

   1. ResizeObserver