在Applet中加入2个复选框，显示标题为“学习”和“玩耍”，根据选择的情况，分别显示“玩耍”、“学习”、“劳逸结合”。-In the Applet to add two check box, and display the title as " learning" and " play" , according to choice, respectively, display " play" , " learning" , &q