if 或 elseif 语句中嵌套另一个 if 或 elseif 语句。if 语句基于最外层 if 语句执行。这使得VBScript 来处理复杂的条件更容易。
语法:
VBScript中的嵌套 if 语句的语法是：
If(boolean_expression) Then Statement 1 ..... ..... Statement n If(boolean_expression) Then Statement 1 ..... ..... Statement n ElseIf (boolean_expression) Then Statement 1 ..... .... Statement n Else Statement 1 ..... .... Statement n End If Else Statement 1 ..... .... Statement n End If
示例
为了演示的目的，找出正数类型在函数的帮助下完成。
Private Sub nested_if_demo_Click() Dim a As Integer a = 23 If a > 0 Then MsgBox "The Number is a POSITIVE Number" If a = 1 Then MsgBox "The Number is Neither Prime NOR Composite" ElseIf a = 2 Then MsgBox "The Number is the Only Even Prime Number" ElseIf a = 3 Then MsgBox "The Number is the Least Odd Prime Number" Else MsgBox "The Number is NOT 0,1,2 or 3" End If ElseIf a < 0 Then MsgBox "The Number is a NEGATIVE Number" Else MsgBox "The Number is ZERO" End If End Sub
当执行上面的代码，它产生了以下结果：
The Number is a POSITIVE Number The Number is NOT 0,1,2 or 3