[removed] Is it possible to pass a variable into a callback function that is assigned to a variable?

Question

A lot of people say that this is asked too much in the comments, which made me hesitant to ask this, but I still have not found a solution in their answers, mostly because (

Answer 1

You can also do this, but maybe it's not necessary:

function iClick(this)
{
    var foo = "I would like to pass this.";

    ajax.onreadystatechange = (function(thevar) {
        return function () { alert(thevar); };
      })(foo);
}