Go byte与rune区别

先看代码

package main

import (
	"fmt"
)

func main() {
	var a = "hello world"

	var b = "中"
	fmt.Println([]rune(a))
	fmt.Println([]rune(b))
	fmt.Println([]byte(b))

}

go源码中的定义

// byte is an alias for uint8 and is equivalent to uint8 in all ways. It is
// used, by convention, to distinguish byte values from 8-bit unsigned
// integer values.
type byte = uint8

// rune is an alias for int32 and is equivalent to int32 in all ways. It is
// used, by convention, to distinguish character values from integer values.
type rune = int32

byte是uint8、rune为uint32，一个仅限于ascii码的值，一个支持更多的值。rune比byte能表达更多的数。

golang默认使用utf8编码，一个中文占用3字节，一个utf8数字占用1字节，utf8字母占用1字节