将[]byte转换成负整数

s := []byte{0xd6}
fmt.Println(int8(s[0]))

package main

import (
    "fmt"
    "unsafe"
)

func main() {

    s := []byte{0xd6}
    var b8 int8
    b8 = *((*int8)(unsafe.Pointer(&s[0])))

    fmt.Println(b8)

}

s := []byte{0xd6}
reader := bytes.NewReader(s)
var a int8
if err := binary.Read(reader, binary.LittleEndian, &a); err != nil {
    log.Fatal(err)
}
fmt.Println(a)