List variables created in anonymous function

Question

If I have some Javascript code like the following...

(function(){
    var a = 'valueA';
    var b = 'valueB';
    var c = 'valueC';

    //Create a loop that prints the name of all variables created above
    for(var x in ?????){
        console.log(x);
    }
})();

How do I print out a list of the variables that have been declared and assigned inside the anonymous function.

Answer 1

正如上面在评论中提到的那样，这是不可能的，如此链接Javascript Reflection中所述

Answer 2

This is very easy if the variables are in an array:

function printVariable() {
   var newArray = [valueA, valueB, valueC....];
   var i;

   for (i = 0; i < newArray.length; i++) {
      console.log(newArray(i));
   }
}