Change flipswitch by javascript

Change flipswitch by javascript

I need to change this flipswitch by javascript. I don't find how to proceed.
Thanks for your help.

<div data-role="page" class="demo" data-title="Panel fixed positioning">
  <form>
    <fieldset>
      <div data-role="fieldcontain">
        <select class="myflipswitch" data-role="flipswitch">
          <option value="0">Off</option>
          <option value="1">On</option>
        </select>
      </div>
    </fieldset>
  </form>
</div>