jQuery - Select everything except a single elements and its children?

Question

I\'m trying to remove everything in the whole body, except of a single element and its children. How can I accomplish this?

Edit 1 Consider the foll

Answer 1

I think that

$("body *").not("body #div2")
           .not("body #div2 #elementtokeep")
           .not("body #div2 #elementtokeep *")
           .remove();

is the easiest way to focus it.

http://jsfiddle.net/6vb2va6g/