1）　　文本框的双向作用（即输入与输出）

2）　　窗体的双重作用（容器与输出）

3）　　事件过程的编写

4）　　输入输出的简单实现

5）　　窗体、文本框、标签、命令按钮等基本控件的常用属性的动-1) the role of two-way text box (that is, input and output) 2) form the dual role of (the container and output) 3) event procedure of the preparation of 4) to achieve a simple input-output 5) form, text box, label, command button basic controls, such as the dynamic properties of commonly used