To evaluate a JavaScript expression:
Go to Window | Open Perspective | Web Browser Tools.
Click
from
the main toolbar.
The “Open URL…” dialog opens.Enter a URL in the “Enter URL…” text field and press Enter.
The URL opens in the Internal Web Browser.Go to the JavaScript view.
Enter your JavaScript expression in the “Expression:” text field and press Enter.
Your JavaScript expression evaluation output appears.
Expand a line to see the complete output of the evaluation.
The
output does not clear automatically, even if you launch a new
evaluation. To clear previous output click the 
.
You can also evaluate JavaScript expressions in the DOM Inspector view. For more information see Evaluating a Node.
