另一个If或ElseIf语句内的If或ElseIf语句。内部If语句是基于最外部If语句执行的。这使VBScript可以轻松处理复杂的条件。
VBScript中的嵌套if语句的语法：
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
<!DOCTYPE html>
<html>
<body>
<script language = "vbscript" type = "text/vbscript">
Dim a
a = 23
If a > 0 Then
Document.write "The Number is a POSITIVE Number"
If a = 1 Then
Document.write "The Number is Neither Prime NOR Composite"
Elseif a = 2 Then
Document.write "The Number is the Only Even Prime Number"
Elseif a = 3 Then
Document.write "The Number is the Least Odd Prime Number"
Else
Document.write "The Number is NOT 0,1,2 or 3"
End If
ElseIf a < 0 Then
Document.write "The Number is a NEGATIVE Number"
Else
Document.write "The Number is ZERO"
End If
</script>
</body>
</html> 执行以上代码后，将产生以下结果：
The Number is a POSITIVE Number The Number is NOT 0,1,2 or 3