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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