toggle js

/* 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! document.getElementById('myButton').onclick = function() {
    this.classList.toggle('active');
}var menu = document.querySelector('.menu') // Using a class instead, see note below.
menu.classList.toggle('hidden-phone');  $(document).ready(function() {
    $("#btnshow").click(function() {
      $("#imgshow").slideToggle();
    });
  })
var clicked = false;

function toggleBtnClick() {
  var img = document.getElementById('baseImg');
  if (clicked) {
    img.src = 'http://via.placeholder.com/350x150/e9e9e9/000000';
    clicked = false;
  } else {
    img.src = 'http://via.placeholder.com/350x150/3fafed/000000';
    clicked = true;
  }
}document.querySelector("#test").hidden = true;
document.querySelector("#test").hidden = false;