参考文章: https://studygolang.com/articles/18194?fr=sidebar https://github.com/cch123/golang-notes/blob/master/slice.md https://blog.haohtml.com/archives/18094 slice: 先看一下slcie结构: runtime/slice.go type slice struct { array unsafe.Pointer len int cap int } slice三要素: type、len、cap slice 的底