javascript get element class code example

Example 1: javascript change element class

//Overwrite all classes
element.className = "class";

//Add class
element.classList.add("class");

Example 2: javascript get class name

document.getElementById("myDIV").className = "mystyle";

Example 3: js get class property

let element = document.querySelector('.preset');
let style = getComputedStyle(element);
let bg = style.backgroundColor;