javascript eval method

Question

How can I watch variable values inside of javascript eval() method? And is it possible to \"step into\" and \"step over\" in eval method? For example, with a code like this:

Answer 1

Although not thoroughly documented or advised, you can watch local variables.

var reference;

function alerta(){
  alert(reference[0]);
}

// Desired to be watched must be called as function arguments
(function(a){
  reference = arguments;

  a = 'taco';
  alerta();
  a = 'updatedValue';
  alerta();

})()

http://jsbin.com/oragan