func changeString() { s1 := "hello" // 强制类型转换 byteS1 := []byte(s1) byteS1[0] = 'H' fmt.Println(string(byteS1)) s2 := "博客" runeS2 := []rune(s2) runeS2[0] = '狗' fmt.Println(string(runeS2))}