# jQuery.isWindow()

Categories: Utilities

## jQuery.isWindow( obj ) Returns: boolean

Description: Determine whether the argument is a window.

- #### version added: 1.4.3jQuery.isWindow( obj )

  objObject to test whether or not it is a window.

This is used in a number of places in jQuery to determine if we're operating against a browser window (such as the current window or an iframe).

### Example:

#### Finds out if the parameter is a window.

    <!DOCTYPE html>
    <html>
    <head>
      <script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
    </head>
    <body>
      Is 'window' a window? <b></b>
    <script>$("b").append( "" + $.isWindow(window) );</script>

    </body>
    </html>

#### Demo: