diff --git a/app/utils/convert.go b/app/utils/convert.go
index 8547d99..3371e7f 100644
--- a/app/utils/convert.go
+++ b/app/utils/convert.go
@@ -9,35 +9,35 @@ import (
 	"strings"
 )
 
-const CODE62 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
-const CODE_LENTH = 62
-
-var EDOC = map[string]int{"0": 0, "1": 1, "2": 2, "3": 3, "4": 4, "5": 5, "6": 6, "7": 7, "8": 8, "9": 9, "a": 10, "b": 11, "c": 12, "d": 13, "e": 14, "f": 15, "g": 16, "h": 17, "i": 18, "j": 19, "k": 20, "l": 21, "m": 22, "n": 23, "o": 24, "p": 25, "q": 26, "r": 27, "s": 28, "t": 29, "u": 30, "v": 31, "w": 32, "x": 33, "y": 34, "z": 35, "A": 36, "B": 37, "C": 38, "D": 39, "E": 40, "F": 41, "G": 42, "H": 43, "I": 44, "J": 45, "K": 46, "L": 47, "M": 48, "N": 49, "O": 50, "P": 51, "Q": 52, "R": 53, "S": 54, "T": 55, "U": 56, "V": 57, "W": 58, "X": 59, "Y": 60, "Z": 61}
-
-func Base62Encode(number int) string {
-	if number == 0 {
-		return "0"
+func Base62Encode(num int) string {
+	if num == 0 {
+		return string(base62Chars[0])
 	}
-	result := make([]byte, 0)
-	for number > 0 {
-		round := number / CODE_LENTH
-		remain := number % CODE_LENTH
-		result = append(result, CODE62[remain])
-		number = round
+
+	var encoded []byte
+	for num > 0 {
+		remainder := num % 62
+		num /= 62
+		encoded = append([]byte{base62Chars[remainder]}, encoded...)
 	}
-	return string(result)
+
+	return string(encoded)
 }
 
+const base62Chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+
 /**
  * 解码字符串为整数
  */
-func Base62Decode(str string) int {
-	str = strings.TrimSpace(str)
-	var result int = 0
-	for index, char := range []byte(str) {
-		result += EDOC[string(char)] * int(math.Pow(CODE_LENTH, float64(index)))
+
+// DecodeBase62 decodes a base62 string to an integer
+func Base62Decode(encoded string) int {
+	var num int
+	for i, char := range encoded {
+		index := strings.IndexRune(base62Chars, char)
+		num += index * int(math.Pow(62, float64(len(encoded)-i-1)))
 	}
-	return result
+	return num
 }
 func ToString(raw interface{}, e error) (res string) {
 	if e != nil {