ButtonDemo按钮Button是mfc最重要的控件之一，Button控件的监听无疑是该控件学习的重中之重。下面用一个demo来说明一下**Button控件的(The ButtonDemo button Button is one of the most important controls in MFC, and the monitoring of the Button control is undoubtedly the most important part of the control. Here's a demo to illustrate the **Button control)