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 |
瀏覽器相容性
BCD tables only load in the browser