fibo.js

var printFibo=function(n) {
  var s1=0;
  var s2=1;
  var s3;
  for (var i = 0; i < n; i++) {
    console.log(s2);
    s3=s1+s2;
    s1=s2;
    s2=s1+s2;
  }
}

var printEvenFibo=function(n) {
  var s1=0;
  var s2=1;
  var s3;
  for (var i = 0; i < n; i++) {
    if(s2%2==0)
      console.log(s2);
    s3=s1+s2;
    s1=s2;
    s2=s1+s2;
  }
}


printFibo(10);
printEvenFibo(10);