This book covers the JavaScript language and the JavaScript APIs implemented by web browsers. I wrote it for readers with at least some prior programming experience who want to learn JavaScript and also for programmers who already use JavaScript but want
to take their understanding to a new level and really master the language and the web platform. My goal with this book is to document the JavaScript language and platform comprehensively and definitively. As a result, this is a large and detailed book. My hope, however, is that it will reward careful study, and that the time you spend reading it will be easily recouped in the form of higher programming productivity.
