Element.className

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句法
范例
注意事项
规范
浏览器兼容性
另请参阅
相关话题

className 特性为 元素 interface gets and sets the value of the class 属性 of the specified element.

句法

var cName = elementNodeReference.className;
elementNodeReference.className = cName;

cName is a string variable representing the class or space-separated classes of the current element.

范例

let el = document.getElementById('item');
if (el.className === 'active'){
  el.className = 'inactive';
} else {
  el.className = 'active';
}

注意事项

名称 className is used for this property instead of class because of conflicts with the "class" keyword in many languages which are used to manipulate the DOM.

className can also be an instance of SVGAnimatedString 若 element 是 SVGElement . It is better to get/set the className of an element using Element.getAttribute and Element.setAttribute if you are dealing with SVG elements. However, take into account that Element.getAttribute 返回 null 而不是 "" 若 element has an empty class 属性 .

elm.setAttribute('class', elm.getAttribute('class'))

class 是 HTML Attribute , while the className 是 DOM Property .

规范

规范	状态	注释
DOM The definition of 'element.className' in that specification.	实时标准
DOM4 The definition of 'element.className' in that specification.	过时
DOM (文档对象模型) 2 级 HTML 规范 The definition of 'element.className' in that specification.	过时	初始定义

浏览器兼容性

The compatibility table on 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
`className`	Chrome 43	Edge 12	Firefox 1	IE 8	Opera 8	Safari 6	WebView Android 43	Chrome Android 43	Firefox Android 4	Opera Android 10.1	Safari iOS 6	Samsung Internet Android 4.0

图例

完整支持

另请参阅

element.classList

元数据

最后修改： 2019 年 3 月 23 日

在此页

句法

范例

注意事项

规范

浏览器兼容性

图例

另请参阅

相关话题