2.js

(function(){

  var i = 2, sum = 0, limit = 4000000;

  do {
    var f = fib(i);
    (f%2==0)?sum+=f:'';
    i++;
  } while (fib(i) < limit)
  
  print(sum);
  
  function fib(n){
    return n<2?n:fib(n-1)+fib(n-2);
  }
})();