测试string的并发写panic

test_string.go

package main

import (
	"fmt"
	"time"
)

var (
	testString string
)

func main() {
	go func() {
		for {
			tmpString := testString
			if tmpString != "0" && tmpString != "11" && tmpString != "" {
				fmt.Println(tmpString)
			}
		}
	}()

	go func() {
		for i := 0; ; i++ {
			switch i % 3 {
			case 0:
				testString = ""
			case 1:
				testString = "1"
			case 2:
				testString = "22"
			}
			time.Sleep(time.Millisecond)
		}
	}()
	select {}
}