Here are a few things you can do with JavaScript:
- Validate forms at the client-side saving both the precious server resources and time.
- Create mouseover effects, change background color of a document with a click of a button… interactivity!
- Randomly display content without the involvement of server programs.
- Move HTML elements around pages.
- Change page contents dynamically.
- Load content in new browser windows and frames.
- Make online games.