How to best use 'this' when its unavailable

say I create someObj like this

var someObj = function(){
  var self = this;
  //use this normally
  document.body.addEventListener('click',function(){
     //use self because this is unavailable
  },false)
}
new someObj();

In the event this is not the someObj which id like to use but in this case the body element. Is there a best practice way to get开发者_JAVA技巧 someObj or is declaring some self var like in the example considered any good?

Using self seems fine to me.
You might also want to check out using call or apply (see for example odetocode and specifically about this in this post)

In my experience, declaring something like 'self' is the easiest way to do it.

I would consider your code to be perfectly acceptable.