Dim st,et,pt
Private Sub Command1_Click()

If Command1.Caption = "开始" Then
st = Now
Text1 = Format(st,"hh:mm:ss")
Command1.Caption = "结束"
Else
et = Now
Text2 = Format(et,"hh:mm:ss")
Command1.Caption = "开始"
pt = et - st
Text3 = Format(pt,"hh:mm:ss")
End If

End Sub
就是利用caption这个变量来反复变换各种参数以致于实现秒表的开始或者结束功能