Iterator.prototype[Symbol.iterator]()

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.

Iterator 实例的 [Symbol.iterator]() 方法实现了可迭代协议,并允许内置迭代器被大多数期望可迭代对象的语法所消费,如展开语法for...of 循环。它返回 this 的值,即迭代器对象本身。

语法

js
iterator[Symbol.iterator]()

参数

无。

返回值

this 的值,即迭代器对象本身。

示例

使用 for...of 循环进行迭代

请注意,你很少需要直接调用这个方法。[Symbol.iterator]() 方法的存在使内置迭代器成为可迭代对象,而像 for...of 循环这样的迭代语法会自动调用这个方法来获取用于进行循环的迭代器。

js
const arrIterator = [1, 2, 3].values();
for (const value of arrIterator) {
  console.log(value);
}
// 输出:1、2、3

规范

Specification
ECMAScript® 2025 Language Specification
# sec-%iteratorprototype%-%symbol.iterator%

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
[Symbol.iterator]

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
Uses a non-standard name.
Has more compatibility info.

参见