js refactoring...

bla.js

var should_reset = false;

if (condition1) {
  alert(1);
}else if (condition2) {
  alert(2);
  should_reset = true;
}else if (condition3) {
  alert(3);
  should_reset = true;
}else{
  return true;
}

if(should_reset) {
  reset();
}

bla2.js

if (condition1) {
  alert(1);
}else if (condition2 || condition3) {
  if(condition2) { 
    alert(2); 
  } else { 
    alert(3); 
  }
  reset();
}else{
  return true;
}

bla3.js

if(condition2 || condition3) {
  reset();
}

if (condition1) {
  alert(1);
}else if (condition2) {
  alert(2);
}else if (condition3) {
  alert(3);
}else{
  return true;
}