Add / Remove class without using jQuery

_toggleClass.js

/*
 * This code is to add or remove class depends on the direction like Smartphone.
 * The classname is 'isActive'.
 */
 
function toogleClass(){
  this.node = document.querySelector(target);
}
toogleClass.prototype.init = function(){
  var self = this;
  window.addEventListener('resize', function(){ self.detection() }, false);
  window.addEventListener('load', function(){ self.detection() }, false);
};
toogleClass.prototype.detection = function(){
  var self = this;
  if( window.innerHeight > window.innerWidth ){
    self.removeClass();
 } else {
    self.addClass();
  }
};
toogleClass.prototype.addClass = function(){
  var self = this;
  if (self.node.classList) {
    self.node.classList.add('isActive');
  } else {
    self.node.className += ' ' + 'isActive';
  }
};
toogleClass.prototype.removeClass = function(){
  var self = this;
  if (self.node.classList) {
    self.node.classList.remove('isActive');
 } else  {
    self.node.className = self.node.className.replace(new RegExp('(^|\\b)' + 'isActive'.split(' ').join('|') + '(\\b|$)', 'gi'), ' ');
  }
};