Trigger <option> binded function by js

Hi. It's my first post in this forum, please be patient
In short i have:

$(document).ready(function(){
  $('select').change(function(){
    alert($(this).val());
  });
  $('select').attr('value', 3 );
});

When JS change the select's option function alert() don't trigger.. Why ?
By what way I can change select to trigger binded function ?

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