Array.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 May 2018.

Symbol.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

js
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

js
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
ECMAScript Language Specification
# sec-array.prototype-%symbol.iterator%

瀏覽器相容性

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參見