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@@iterator 屬性的初始值與 values() 屬性的初始值為相同的的函式物件。

語法

arr[Symbol.iterator]()

回傳值

陣列的迭代器(iterator)函式,預設與 values() 函式相同。

範例

使用 for...of 迴圈進行迭代

var arr = ['w', 'y', 'k', 'o', 'p'];
var eArr = arr[Symbol.iterator]();
// your browser must support for..of loop
// and let-scoped variables in for loops
for (let letter of eArr) {
  console.log(letter);
}

另一種迭代方式

var arr = ['w', 'y', 'k', 'o', 'p'];
var eArr = arr[Symbol.iterator]();
console.log(eArr.next().value); // w
console.log(eArr.next().value); // y
console.log(eArr.next().value); // k
console.log(eArr.next().value); // o
console.log(eArr.next().value); // p

規範

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Array.prototype[@@iterator]()' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Array.prototype[@@iterator]()' in that specification.
Draft  

瀏覽器相容性

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support38 ?

36

27 — 361 2

17 — 273 4

No25 Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes ?

36

27 — 361 2

17 — 273 4

Yes Yes Yes

1. A placeholder property named @@iterator is used.

2. Supported as @@iterator.

3. A placeholder property named iterator is used.

4. Supported as iterator.

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