On...GoSub Statement; On...GoTo Statement

根据数字表达式的值，跳转到程序代码中的指定行。

语法:

On GoSub/GoTo syntax


On expression GoSub Label1[, Label2[, Label3[,...]]]
On expression GoTo Label1[, Label2[, Label3[,...]]]

参数:

expression: Any numeric expression between 0 and 255 that determines which of the lines the program branches to. If expression is 0, the statement is not executed. If expression is greater than 0, the program jumps to the label that has a position number that corresponds to the expression (1 = First label; 2 = Second label)

label: Target line according to GoTo or GoSub structure.

「GoTo」或「GoSub」规范有效。

示例:


Sub ExampleOnGosub
Dim iVar As Integer
Dim sVar As String
    iVar = 2
    sVar =""
    On iVar GoSub Sub1, Sub2
    On iVar GoTo Line1, Line2
    Exit Sub
Sub1:
    sVar =sVar & " From Sub 1 to" :Return
Sub2:
    sVar =sVar & " From Sub 2 to" :Return
Line1:
    sVar =sVar & " Label 1" :GoTo Ende
Line2:
    sVar =sVar & " Label 2"
Ende:
    MsgBox sVar,0,"On...GoSub"
End Sub

GoSub...Return Statement

GoTo Statement