DOMTokenList.length

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

**length**是 DOMTokenList 接口的一个只读属性,以整数来表示,代表着当前对象中值的个数。

语法

tokenList.length;

数值

一个整数。

示例

在示范例子里我们编写了一个 span 元素,使用Element.classList去检索元素<span>拥有的类,放回一个实时的DOMTokenList集合,然后把该集合中的数值个数写进 <span>Node.textContent 属性中。

HTML 代码:

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

JavaScript 代码:

js
var span = document.querySelector("span");
var classes = span.classList;
var length = classes.length;

span.textContent = "classList length = " + length;

运行得出的结果如下:

规范

Specification
DOM
# ref-for-dom-domtokenlist-length①

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
length

Legend

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Full support
Full support