Is it possible to add a class using javascript? no id and class in the div

Question

See the attached image, I would like to add a class where the arrow is pointing.

thanks.

Answer 1

You can get all the div elements with

getElementsByTagName('div')

Then you can add it to the second element by adding the new class to the element at indice 1

document.getElementsByTagName('div')[1].classList.add('foo');

 document.getElementsByTagName('div')[1].classList.add('foo');

 .foo { background-color: purple; }

 <div> <div>HI <div> </div> </div> </div>

Answer 2

The getElementsByTagName() method returns a collection of all elements in the document with the specified tag name (don't forget to check the length so you won't get a null exception)

const divs = document.getElementsByTagName('div');
if (divs.length > 1){
    divs[1].classList.add('your-class');
}