1.窗口事件实现任务栏提示，键盘事件实现shift的按键提醒2.保存用户登录信息，登录成功跳转至welcome.htm网页，登录失败提示错误3.读取书籍数据文件data1.txt到表单。(The 1. window event Implementation Task Tips, shift key keyboard events remind 2. save user login information, successful login to jump to the welcome.htm page, login failed error 3. read books to form data file data1.txt.)