TypedArray.prototype.keys()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.

keys() 方法返回新的 Array Iterator 对象,包含数组中每个下标的键。

语法

js
keys()

返回值

新的 Array Iterator 对象

示例

使用for...of循环的迭代

js
var arr = new Uint8Array([10, 20, 30, 40, 50]);
var eArray = arr.keys();
// 你的浏览器必须支持 for..of 循环
// 以及 for 循环中的 let 区域变量
for (let n of eArray) {
  console.log(n);
}

备选的迭代

js
var arr = new Uint8Array([10, 20, 30, 40, 50]);
var eArr = arr.keys();
console.log(eArr.next().value); // 0
console.log(eArr.next().value); // 1
console.log(eArr.next().value); // 2
console.log(eArr.next().value); // 3
console.log(eArr.next().value); // 4

规范

Specification
ECMAScript Language Specification
# sec-%typedarray%.prototype.keys

浏览器兼容性

BCD tables only load in the browser

参见