javascript that turns on and off a class code example

Example 1: toggle css class in javascript

/* var or const followed by its name */.getElementById(/* HTML element ID */);
/* var or const's name */.classList.toggle(/* Name of CSS class */);
// I hope this helps!

Example 2: classname toggle js

document.getElementById('myButton').onclick = function() {
    this.classList.toggle('active');
}