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Update array.md

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ConradZhangcong 2021-11-23 11:30:52 +08:00
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@ -845,8 +845,8 @@ arr.flatMap(function callback(currentValue[, index[, array]]) {
```javascript
const arr = [5, 12, 8, 130, 44];
arr.at[2] // 8
arr.at[-2] // 130
arr.at(2) // 8
arr.at(-2) // 130
```
如果参数位置超出了数组范围，`at()`返回`undefined`。