Limit string length / trim text with jQuery

<div id="trimHolder">
      <h2>My big header goes here bla bla bla bla bla
          bla bla bla bla bla lorem ipsum lorem </h2>
</div>

$(document).ready(function(){

var star = jQuery('#trimHolder > h2');

if ( star.text().length > 30  ) {
// trims it to 30 charcters
star.text(star.text().substr(0,30));
// 17 charcters + .......
star.append('.....');
}

});

http://codepen.io/anon/pen/ZQWajq