JS数组切割

切割数组得到头部

> let a = [1, 2, 3, 4, 5, 6]
> a.slice(2)
[3, 4, 5, 6]
> a.splice(2)
[3, 4, 5, 6]

根据索引切取指定范围内的数组

> let arr = [1, 2, 3, 4, 5, 6]
> arr.slice(2, 5)
[3, 4, 5]

切割数组得到尾部

eg: 切割数组后面的几个
> let arr = [1, 2, 3, 4, 5, 6]
> arr.slice(2)
[3, 4, 5, 6]