程序里 根据 “-”分割字符串 取第一个

package main

import (
	"fmt"
	"strings"
)

func main() {

	str := []string{"02-2", "01-1", "03-0"}
	
        for _, v := range str {
		fmt.Println(v, "=>", strings.Split(v, "-")[0])
	}
}

输出

02-2 => 02
01-1 => 01
03-0 => 03