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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

observe() 方法在 ResizeObserver interface starts observing the specified 元素 or SVGElement .

句法

resizeObserver.observe(target, options);
					

参数

target

A reference to an 元素 or SVGElement to be observed.

选项 可选

An options object allowing you to set options for the observation. Currently this only has one possible option that can be set:

box

Sets which box model the observer will observe changes to. Possible values are content-box (the default), and border-box .

返回值

Void.

异常

None.

范例

The following snippet is taken from the resize-observer-text.html ( see source ) example:

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);
								

An observe() call with an options object would look like so:

resizeObserver.observe(divElem, { box : 'border-box' });
								

规范

规范	状态	注释
重置大小观测器 The definition of 'observe()' 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
observe	Chrome 64	Edge 79	Firefox 69	IE No	Opera 51	Safari 13.1	WebView Android 64	Chrome Android 64	Firefox Android No	Opera Android 47	Safari iOS 13.4	Samsung Internet Android 9.0

图例

完整支持

完整支持

不支持

不支持

元数据

• 最后修改： Aug 29, 2019

相关话题

1. 重置尺寸观测器 API
2. ResizeObserver
3. 构造函数

   1. ResizeObserver()
4. 方法

   1. disconnect()
   2. observe()
   3. unobserve()
5. Related pages for Resize Observer API

   1. ResizeObserverEntry