1. 选择点餐品种后，光标自动处于数量输入框中。（提示：文本框的setFocus方法）
2. 单击“确定”按钮后，根据点餐的品种和数量，计算总金额；如果是外送，加收20元。将点餐的帐单明细表用消息框给出。（提示：将所有的内容通过字符的连接组合为一项作为MsgBox的提示项，需要换行的地方连接上VB预定义常量vbCrLf，即回车换行符）
3. 单击“下一位”按钮后，作好下一位点餐的准备。
4. 注意两个命令按钮的Enabled属性的合理设置。(1. after selecting the variety of the meal, the cursor is automatically in the number input box. (hint: the setFocus method of the text box)
2. click the "confirm" button and calculate the total amount according to the variety and quantity of the point meal; if it is sent out, add 20 yuan. The table list is given with a message box. (hint: all contents are combined by character connection to be a reminder item for MsgBox, where VB is required to line up, and the vbCrLf is predefined constant, that is, carriage return line.
3. click the next button and prepare for the next meal.
4. notice the reasonable setting of the Enabled properties of the two command buttons.)