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
}