速算24游戏 游戏规则： （1）点击“开始游戏”的按钮，游戏开始，系统将会发出四张牌 （2）用户将发出的四张牌用+,-,*,/组合起来，并把组合的表达式输入到输入框里头 （3）点击确定按钮，游戏将会计算你输入的表达式是否合法，或者结果是否正确，并且给出提示。 （4）如果输入的表达式不正确，则会让用户重新输入；如果输入的表达式正确，则重新开始游戏-Quick count of 24 games the rules of the game: (1) Click the　Start Game　button, the game started, the system will issue four licenses (2) 4 users will be issued a license to use 2B !,-,*,/ together, and the combination of expression first entered into the input box (3) Click the OK button, the game will calculate whether you have entered the legitimate expression, or the results are correct, and gives tips. (4) If you enter the expression is not correct, then allow the user to re-enter　If you enter the correct expression, then re-start the game