通过对输入的字符判断，进行检测所得到的括号种类，和其匹配程度。通过得到的字符做预判，在显示到屏幕上，避免异常出现，后两题由于时间问题并没有找到合适的解决方法。-Tested by judging the input characters, types of braces, and its matching degree. By the characters get to do, on the display to the screen, avoid appear abnormal, after two questions due to the time problem didn t find the right solution.