1. Always use jslint. 2. Read good JavaScript (as others have said). The jquery source is a good place to start. Underscore.js is good, too. Unfortunately ther

1. Always use jslint. 2. Read good JavaScript (as others have said). The jquery source is a good place to start. Underscore.js is good, too. Unfortunately there isn't consensus about what is and what isn't good JavaScript. Some people seem to be suggesting Prototype as an example of good js, which I would disagree with.