说明：  no intro
(1. With user login function, new users can be registered and passwords can be changed. 2. After entering the game, the user decides to throw a few dices and guess the size. The system makes a judgment and asks the user whether to enter the next round of the game. 3. The amount of the bet and the odds. The initial amount is 1000 yuan, when the amount becomes zero, the game ends, and the default odds are double. If the right amount can be obtained, the wrong amount will be lost. 4. User's remaining amount and rank can be viewed 5. Log out and switch accounts)