package main

import (
   "fmt"
   "reflect"
)

func main(){
   asci:="abc"
   ch:="我是中国人"
   mix:="i am 中国人"
   fmt.Println(
      reflect.TypeOf(asci),
      reflect.TypeOf(ch),
      reflect.TypeOf(mix),
   )
   fmt.Println(
      reflect.TypeOf(asci[0]),
      reflect.TypeOf(ch[0]),
      reflect.TypeOf(mix[0]),
   )
   for i,v:=range asci{
      fmt.Println(reflect.TypeOf(asci[i]), reflect.TypeOf(v), string(v), string(asci[i]), string(asci[:3]) )
      break
   }
   for i,v:=range ch{
      fmt.Println(reflect.TypeOf(asci[i]), reflect.TypeOf(v),string(v), string(ch[i]), string(ch[:3]))
      break
   }
   for i,v:=range mix{
      fmt.Println(reflect.TypeOf(asci[i]), reflect.TypeOf(v), string(v), string(mix[i]), string(mix[:3]))
      break
   }

    s := "截取中文"
    //试试这样能不能截取?
    fmt.Println(s[:3])

    fmt.Println(string([]rune(s)[:3]))