Nov 18th, 2012
This is a quick snippet showing a basic wrapper for your JS code in Drupal. To understand it, I recommend reading the breakdown of Drupal's JS on drupal.org, which was written for Drupal 6 but mostly applies to Drupal 7, Drupal 8, and Drupal 9 too: https://drupal.org/node/304258
I also recommend reading the Mozilla Development Network's article titled "A re-introduction to JavaScript (JS Tutorial)": https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_Jav...
If you are hard core, then go one more step and read the Drupal JS coding standards: https://drupal.org/node/172169