go 生成随机小数 指定范围

package main

import (
        "crypto/hmac"
        "crypto/sha1"
        "encoding/base64"
        "encoding/json"
        "errors"
        "fmt"
        "net/http"
        "net/url"
        "strings"
        "time"
        "math/rand"
        "strconv"

        . "github.com/nntaoli-project/GoEx"
        "github.com/sumorf/goalgo"
        "github.com/sumorf/goalgo/log"
)


func main(){
//必须是位数相同,前面的也要相同(反正就是不好用,但是我上网搜了也搜不到,只是符合我的需求而已)
　　RandFloat64(0.001234,0.009874)
}


//随机整数
func RandInt64(min, max int64) int64 {
        if min >= max || min == 0 || max == 0 {
                return max
        }
        rand.Seed(time.Now().UnixNano())
        return rand.Int63n(max-min) + min
}
//zll 生成指定范围的随机小数,注:很不智能,所以限制min和max前面的数字必须相同例如min:0.00123456 max:0.00222336这样
func RandFloat64(min,max float64) float64{
        //转为字符串
        my_min := strconv.FormatFloat(min,'f',-1,64)
        my_max := strconv.FormatFloat(max,'f',-1,64)

        if len(my_min)!=len(my_max){
                return 0
                //fmt.Println("错误")
        }else{
                qianzhui := ""
                houzhui1 := ""
                houzhui2 := ""
                sw := 0
                for i := 0;i<len(my_min);i++ {
                        str1 := string(my_min[i])
                        str2 := string(my_max[i])
                        if sw==0{
                                if my_min[i]==my_max[i]{
                                        qianzhui = qianzhui + str1
                                }else{
                                        sw = 1
                                        houzhui1 = houzhui1 + str1
                                        houzhui2 = houzhui2 + str2
                                }
                        }else{
                                houzhui1 = houzhui1 + str1
                                houzhui2 = houzhui2 + str2
                        }
                }
                //return 0,qianzhui+"**"+houzhui1+"**"+houzhui2
                //fmt.Println(qianzhui+"**"+houzhui1+"**"+houzhui2)
                //前缀字符串转整数
                qian1,_ := strconv.ParseInt(houzhui1,10,64)
                qian2,_ := strconv.ParseInt(houzhui2,10,64)
                //生成随机整数
                jj := RandInt64(qian1,qian2)
                //随机整数转字符串
                jj_str := strconv.FormatInt(jj,10)
                //前缀拼接随机字符串
                all_str := qianzhui+jj_str
                //全字符串转浮点数
                jieguo,_ := strconv.ParseFloat(all_str,64)
                return jieguo
        }
        return 0
}