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Private Sub Command1_Click()
Timer1.Enabled = ①
End Sub
Private Sub Timer1_Timer()
sec = Val(Text2.Text)
min = Val(Text1.Text)
If sec> 0 Then
sec =" sec" - 1
Else
sec =" 59"
If min > 0 Then
min =" min" - 1
Else
Text1 = 0
Text2 = 0
MsgBox "倒计时时间到"
End If
End If
Text1 = min
Text2 = sec
End Sub
程序中①处应该填
计时器timer1的inteval属性应该设置为
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
