Many of the posts on this blog include fully-functional sample scripts.
To use these sample scripts, you must copy–paste them into a text editor such as Notepad (not into a word processor!) and then save them with a .jsx extension.
The resulting .jsx file must be placed into InDesign’s Scripting folder. The script will then appear inside the scripts panel in InDesign, and you can double-click on it to run.
Here’s an example:
// Select all this text. // Copy–paste it into a text editor. // Save with a .jsx extension. // Place into the InDesign Scripting folder on your harddrive. // Double-click on it in the InDesign scripts panel. alert("Success!");