VBScript is a client-side scripting language, whose syntax confirms with
Visual Basic (rather than Java). Runs only in Microsoft Internet Explorer (IE).

 

Included within

 

<script language = "VBScript"><!—

 

//--></script>

 

Syntax differences from JavaScript:

 

Comments:     ‘ (apostrophe) instead of //

 

Variable declaration:

 

Dim      instead of         Var       Note: use & instead of + for string concatenation

 

Array declaration:

 

Dim numbers(10)               Note: use ( ) instead of [ ] for subscripts

 

Conditional statements:

 

If  condition Then

     … statements …

Else

     .. statements …

End If

 

Select Case expression

   Case value_1

 

   Case value_n

 

   Case Else                 ‘default

 

End Select

 

Can use multiple comma-separated values per case,  Is and To  keywords,

and logical operators, And, Or, Not.

 

Function definitions

 

Function calculate()

...  body of function ...

End Function

 

You can define subroutines as well (don’t return values):

 

Sub calculate()

...  body of procedure ...

End Sub

 

Loops:

 

For loop:

 

For var = 1 To 10 Step 2

     … body of loop …

Next var     or just Next

 

While loop

 

Do While conditional_expr          Note: exits on False

… body of loop …

Loop

 

Do Until loop

 

Do

… body of loop …

Loop Until conditional_expr      Note: exits on True

 

I/O functions document.write(), window.alert(), confirm(), prompt() work similarly to JavaScript. There are many functions that do not have equivalents in JavaScript.