splice detele is error

[dylanass]

let myArray2 = [1,2,3,4,5]
myArray2.splice(4,2)
myArray2 => [1, 2, 3, 4]

[XPoet]

这样肯定报错，索引 4 起只有一个元素，你要删除 2 个，就会报错