DOMTokenList.item()

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句法
范例
规范
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item() 方法在 DOMTokenList interface returns an item in the list by its index.

句法

tokenList.item(index)

参数

index: DOMString representing the index of the item you want to return.

返回值

A DOMString representing the returned item. It returns null if the number is greater than or equal to the length of the list.

范例

In the following example we retrieve the list of classes set on a <span> element as a DOMTokenList 使用 Element.classList . We then retrieve the last item in the list using item( tokenList .length - 1) , and write it into 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 item = classes.item(classes.length-1);
span.textContent = item;

输出看起来像这样：

规范

规范	状态	注释
DOM The definition of 'item()' 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
`item`	Chrome 1	Edge 12	Firefox Yes	IE 10	Opera Yes	Safari 5.1	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS 5.1	Samsung Internet Android Yes

图例

完整支持

元数据

最后修改： May 15, 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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图例

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