Golang 62进制转10进制

62进制字符串转10进制数字

func Base62ToDec(str string) int64 {
	base62 := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	base := int64(len(base62))
	var result int64
	for i, char := range str {
		exp := len(str) - i - 1
		index := strings.IndexByte(base62, byte(char))
		result += int64(math.Pow(float64(base), float64(exp))) * int64(index)
	}
	return result
}