The `entries()`返回新的`Array Iterator`对象，包含数组每个下标处的键值对。

## 语法

    arr.entries()

### 返回值

新的`Array Iterator`对象。

## 示例

### `使用for...of` 循环的迭代

    var arr = new Uint8Array([10, 20, 30, 40, 50]);
    var eArray = arr.entries();
    // 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);
    }

### 备选迭代

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

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 2015 (6th Edition, ECMA-262) %TypedArray%.prototype.entries() | Standard | 初始定义。
ECMAScript Latest Draft (ECMA-262) %TypedArray%.prototype.entries() | Draft |

## 浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

- Desktop
- Mobile

Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari
--- | --- | --- | --- | --- | ---
Basic support | 45.0 | 37 (37) | 未实现 | 36.0 | 未实现

Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
Basic support | 未实现 | (Yes) | 37.0 (37) | 未实现 | 未实现 | 未实现

## 另见

- JavaScript 类型化数组
- `TypedArray`
- `TypedArray.prototype.keys()`
- `TypedArray.prototype.values()`
- `TypedArray.prototype[@@iterator]()`