javascript - How to change a style property of element by class name without any use of ID's in JS? -


i doing school project , it's first time using js, , not allowed use id's css styling, on event user want change style of div in page:

html:

<div class="ads">   ... </div>

css: 

.ads{     display:block;     //and other style properties }

and when user event want change display property :

display : none;

i know how can done using id element, how can done class name?

i able this:

document.getelementsbyclassname('ads').style.display=none;

thank you.

if know there 1 element class, use first element of nodelist document.getelementsbyclassname returns:

document.getelementsbyclassname('ads')[0].style.display = 'none';

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