DOMTokenList.length

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句法
范例
规范
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length 只读特性在 DOMTokenList interface is an integer representing the number of objects stored in the object.

句法

tokenList.length;

值

An integer .

范例

In the following example we retrieve the list of classes set on a <span> element as a DOMTokenList 使用 Element.classList , then write the length of the list to the <span> 's Node.textContent .

First, the HTML:

<span class="a b c"></span>

Now the JavaScript:

let span = document.querySelector("span");
let classes = span.classList;
let length = classes.length;
span.textContent = `classList length = ${length}`;

输出看起来像这样：

规范

规范	状态	注释
DOM The definition of 'length' in that specification.	实时标准	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
`length`	Chrome 1	Edge 12	Firefox 50	IE 10	Opera Yes	Safari 5.1	WebView Android Yes	Chrome Android Yes	Firefox Android 50	Opera Android Yes	Safari iOS 5.1	Samsung Internet Android Yes

图例

完整支持

元数据

最后修改： Jan 17, 2020

DOM (文档对象模型)
DOMTokenList
特性
1. length
方法
1. add()
2. contains()
3. entries()
4. forEach()
5. item()
6. keys()
7. remove()
8. replace()
9. supports()
10. toggle()
11. value
12. values()
DOM 相关页面

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句法

值

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