Answers for "javascript get class"

javascript get all classes

var allHiddenElements = document.getElementsByClassName("hidden");

javascript get class name

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

js get class property

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

how to get class name of element in javascript

var spans = document.getElementsByTagName("span");
for (var i = 0; i < spans.length; i++) {
    if (spans[i].className == 'xyz') {
        spans[i].style.backgroundColor = '#000';
    }
}

get class of object javascript

class Dog{}
var dog = new Dog();
if(dog instanceof Dog){
  console.log("Is dog");
}