Public Class Form1
    Dim t%
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        t = Val(InputBox("输入分钟")) * 60
        ProgressBar1.Minimum = 0
        ProgressBar1.Maximum = t
        ProgressBar1.Value = t
        Timer1.Interval = 1000
        Timer1.Enabled = False

    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

      



        Label1.Text = t \ 60 & ":" & t Mod 60
        ProgressBar1.Value = t
        t = t - 1

        If t < 0 Then
            Timer1.Enabled = False
        End If

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click


        Timer1.Enabled = True
    End Sub
End Class