DOMTokenList.forEach()

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句法
范例
Polyfill
规范
浏览器兼容性
另请参阅
相关话题

forEach() 方法在 DOMTokenList interface calls the callback given in parameter once for each value pair in the list, in insertion order.

句法

tokenList.forEach(callback [, thisArg]);

参数

callback

Function to execute for each element, eventually taking three arguments:

currentValue
currentIndex
listObj: The array that forEach() is being applied to.

thisArg 可选

Value to use as


									this

when executing


								
									callback

返回值

undefined .

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 when retrieve an iterator containing the values using forEach() , writing each one to the <span> 's Node.textContent 在 forEach() inner function.

HTML

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

JavaScript

let span = document.querySelector("span");
let classes = span.classList;
let iterator = classes.values();
classes.forEach(
  function(value, key, listObj) {
    span.textContent += `${value} ${key}/${this}  ++  `;
  },
  "arg"
);

结果

Polyfill

This polyfill adds compatibility to all Browsers supporting ES5 :

if (window.DOMTokenList && !DOMTokenList.prototype.forEach) {
  DOMTokenList.prototype.forEach = function (callback, thisArg) {
    thisArg = thisArg || window;
    for (var i = 0; i < this.length; i++) {
      callback.call(thisArg, this[i], i, this);
    }
  };
}

规范

规范	状态	注释
DOM The definition of 'forEach() (as iterable<Node>)' 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
`forEach`	Chrome 45	Edge 16	Firefox 50	IE 不支持 No	Opera 32	Safari 10	WebView Android 45	Chrome Android 45	Firefox Android 50	Opera Android 32	Safari iOS 10	Samsung Internet Android 5.0

图例

完整支持
不支持

另请参阅

DOMSettableTokenList (object that extends DOMTokenList with settable .value property)

元数据

最后修改： Jun 22, 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

参数

返回值

范例

HTML

JavaScript

结果

Polyfill

规范

浏览器兼容性

图例

另请参阅

相关话题