what this means in JavaScript

As someone new to JavaScript programming, there are many language features that are so uncomfortable. What *this* really means and referring to is one of the pains.

Finally, after reading some nice articles, I think I start to get the idea: it basically means the context/scope the function is called and can change at runtime.

Two great articles that explains this clearly:

• The basics about this from quirksmode
• A more in-depth look at this and how to use it in real world from DWM