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// this js is for mobile, to toggle the navbar
(function (window, document) {  const layout   = document.getElementById('layout'),        menu     = document.getElementById('menu'),        menuLink = document.getElementById('menuLink'),        content  = document.getElementById('content');
  function toggleClass(element, className) {    const classes = element.className.split(/\s+/),          length = classes.length;
    for(let i = 0; i < length; i++) {      if (classes[i] === className) {        classes.splice(i, 1);        break;      }    }    // The className is not found    if (length === classes.length) {        classes.push(className);    }
    element.className = classes.join(' ');  }
  function toggleAll(e) {    let active = 'active';
    e.preventDefault();    toggleClass(layout, active);    toggleClass(menu, active);    toggleClass(menuLink, active);  }
  menuLink.onclick = function (e) {    toggleAll(e);  };
  content.onclick = function(e) {    if (menu.className.indexOf('active') !== -1) {      toggleAll(e);    }  };
}(this, this.document));