classlist code example

Example 1: classList has class

if (document.body.classList.contains('thatClass')) {
    // do some stuff
}

Example 2: classlist

// use the classList API to remove and add classes
div.classList.remove("foo");
div.classList.add("anotherclass");

Example 3: .classList

// .classList method returns an array of the classes attached to the element it is called with.
document.getElementById("myDIV").classList
// It returns
// [ 'className1', 'className2', ... ]