Element.computedStyleMap()

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句法
范例
规范
浏览器兼容性
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这是实验性技术
检查浏览器兼容性表格要小心谨慎在生产中使用这之前。

computedStyleMap() 方法在 元素 interface returns a StylePropertyMapReadOnly interface which provides a read-only representation of a CSS declaration block that is an alternative to CSSStyleDeclaration .

句法

var stylePropertyMapReadOnly = Element.computedStyleMap()

参数

None.

返回值

A StylePropertyMapReadOnly 接口。

范例

We start with some simple HTML: a paragraph with a link, and a definition list to which we will add all the CSS Property / Value pairs.

<p>
   <a href="https://example.com">Link</a>
</p>
<dl id="regurgitation"></dl>

We add a little bit of CSS

a {
  --colour: red;
  color: var(--colour);
}

We add JavaScript to grab our link and return back a definition list of all the CSS property values using computedStyleMap().

// get the element
const myElement = document.querySelector('a');
// get the <dl> we'll be populating
const stylesList = document.querySelector('#regurgitation');
// Retrieve all computed styles with computedStyleMap()
const allComputedStyles = myElement.computedStyleMap();
// iterate thru the map of all the properties and values, adding a <dt> and <dd> for each
for (const [prop, val] of allComputedStyles) {
	// properties
	const cssProperty = document.createElement('dt');
	cssProperty.appendChild(document.createTextNode(prop));
	stylesList.appendChild(cssProperty);
	// values
	const cssValue = document.createElement('dd');
	cssValue.appendChild(document.createTextNode(val));
	stylesList.appendChild(cssValue);
}

在 browsers that support computedStyleMap() , you'll see a list of all the CSS properties and values. In other browsers you'll just see a link.

Did you realize how many default CSS properties a link had? Update the ' a ' to the ' p ', and you'll notice a difference in the margin-top and margin-bottom default computed values.

规范

规范	状态	注释
CSS Typed OM Level 1 The definition of 'computedStyleMap()' in that specification.	工作草案	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
`computedStyleMap`	Chrome 66	Edge 79	Firefox No	IE No	Opera 53	Safari No	WebView Android 66	Chrome Android 66	Firefox Android No	Opera Android 47	Safari iOS No	Samsung Internet Android 9.0

图例

完整支持
不支持
实验。期望将来行为有所改变。

元数据

最后修改： Jul 1, 2019

在此页

句法

参数

返回值

范例

规范

浏览器兼容性

图例

相关话题