Set.prototype.entries()

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.

Set 实例的 entries() 方法返回一个新的集合迭代器对象,该对象包含了此集合中每个元素的 [value, value] 数组,按插入顺序排列。Set 对象没有类似于 Map 对象中的 key。因此,为了保持 API 与 Map 对象类似,这里每个 entrykeyvalue 都相同,所以返回的数组为 [value, value]

尝试一下

const set1 = new Set();
set1.add(42);
set1.add("forty two");

const iterator1 = set1.entries();

for (const entry of iterator1) {
  console.log(entry);
  // Expected output: Array [42, 42]
  // Expected output: Array ["forty two", "forty two"]
}

语法

js
entries()

参数

无。

返回值

示例

使用 entries()

js
const mySet = new Set();
mySet.add("foobar");
mySet.add(1);
mySet.add("baz");

const setIter = mySet.entries();

console.log(setIter.next().value); // ["foobar", "foobar"]
console.log(setIter.next().value); // [1, 1]
console.log(setIter.next().value); // ["baz", "baz"]

规范

Specification
ECMAScript® 2025 Language Specification
# sec-set.prototype.entries

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
entries

Legend

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

Full support
Full support

参见