VBScript If..ElseIf..Else 语句

一条 If 语句，后跟一个或多个由布尔表达式组成的 ElseIf 语句，然后跟一个默认的 else 语句，该语句执行 当所有条件都变为假时。

语法

VBScript 中 If-ElseIf-Else 语句的语法为 −

If(boolean_expression) Then
   Statement 1
	.....
	.....
   Statement n
ElseIf (boolean_expression) Then
   Statement 1
	.....
	....
   Statement n
ElseIf (boolean_expression) Then
   Statement 1
	.....
	....
   Statement n
Else
   Statement 1
	.....
	....
   Statement n
End If

流程图

示例

<!DOCTYPE html>
<html>
   <body>
      <script language = "vbscript" type = "text/vbscript">
         Dim a  
         a = -5

         If a > 0 Then
            Document.write "a is a POSITIVE Number"
         ElseIf a < 0 Then
            Document.write "a is a NEGATIVE Number"
         Else
            Document.write "a is EQUAL than ZERO"
         End If
      </script>
   </body>
</html>

执行上述代码时，会产生以下结果 −

a is a NEGATIVE Number

vbscript_decisions.html