写一下，好久没更新博客了。

import (
    "fmt"
    "strings"
    "testing"
    "time"
)

/**
*Created by 908204694@qq.com 
*/

//版本号大
const VersionBig = 1

//版本号小
const VersionSmall = 2

//版本号相等
const VersionEqual = 0

func Test_version(t *testing.T) {

    versionA := "1.2.3a"
    versionB := "1.2.3b"
    fmt.Println(compareStrVer(versionA, versionB))

    time.LoadLocation("Local")
    fmt.Println(time.Now())
}

func compareStrVer(verA, verB string) int {

    verStrArrA := spliteStrByNet(verA)
    verStrArrB := spliteStrByNet(verB)

    lenStrA := len(verStrArrA)
    lenStrB := len(verStrArrB)

    if lenStrA != lenStrB {
        panic("版本号格式不一致")

    }

    return compareArrStrVers(verStrArrA, verStrArrB)
}

// 比较版本号字符串数组
func compareArrStrVers(verA, verB []string) int {

    for index, _ := range verA {

        littleResult := compareLittleVer(verA[index], verB[index])

        if littleResult != VersionEqual {
            return littleResult
        }
    }

    return VersionEqual
}

//
// 比较小版本号字符串
//
func compareLittleVer(verA, verB string) int {

    bytesA := []byte(verA)
    bytesB := []byte(verB)

    lenA := len(bytesA)
    lenB := len(bytesB)
    if lenA > lenB {
        return VersionBig
    }

    if lenA < lenB {
        return VersionSmall
    }

    //如果长度相等则按byte位进行比较

    return compareByBytes(bytesA, bytesB)
}

// 按byte位进行比较小版本号
func compareByBytes(verA, verB []byte) int {

    for index, _ := range verA {
        if verA[index] > verB[index] {
            return VersionBig
        }
        if verA[index] < verB[index] {
            return VersionSmall
        }

    }

    return VersionEqual
}

// 按“.”分割版本号为小版本号的字符串数组
func spliteStrByNet(strV string) []string {

    return strings.Split(strV, ".")
}