jQuery Link Ativo

by Tiago Sousa

HTML

<button id="my_btn"><img src="http://placekitten.com.s3.amazonaws.com/homepage-samples/200/140.jpg" /></button>

CSS

.ativo > img{
  opacity: 0.5;
}

JavaScript

$('#my_btn').click(function() {
  $(this).toggleClass('ativo');
});