dim yn as boolean = false
For i As Integer = 1 To 2 '第一个for
For ii As Integer = 1 To 2 '第二个for
For iii As Integer = 1 To 2 '第三个for
yn = true '如果符合条件,就让它为true
Output.Show(1)
Exit For '退出第一个for
Next
if yn = true then
Exit For '退出第二个for继续执行第一个for Output.Show(2)
end if
Next
Output.Show(3)
Next