Array.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 May 2018.

entries() 方法會回傳一個包含陣列中每一個索引之鍵值對（key/value pairs）的新陣列迭代器（Array Iterator）物件。

嘗試一下

語法

js
entries()

回傳值

一個新的 Array 迭代器物件。

範例

使用 for...of 進行迭代

js
var a = ["a", "b", "c"];
var iterator = a.entries();

for (let e of iterator) {
  console.log(e);
}
// [0, 'a']
// [1, 'b']
// [2, 'c']

規範

Specification
ECMAScript Language Specification
# sec-array.prototype.entries

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