tab switch in js ,which is faster?
<p>I always romoving 'current' class of all siblings then add 'current' class to my clicked one. I want to know will it be faster only removing 'current' class of which has 'current'.seems to be a simple question, but I really want to know. </p>

<p><img src="http://i.stack.imgur.com/R6vXc.png" alt="enter image description here"></p>
