How to add new class in div via javascript?

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Hello Everyone i am using wordpress slider but i want to add new class in slider <li> via javascript. 

<div class="wp-slider">
 <ul>
 <li></li>
 </ul>
</div>
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1 comment

  1. In Javascript : 

    document.querySelector('.wp-slider ul li').classList.add('MyClass')

    (or in JQuery 🙂

    $('.wp-slider ul li').addClass("MyClass")