Сергей delphinpro

async function postData(url = '', data = {}) {
  const response = await fetch(url, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify(data)
  });
  return await response.json();
}

postData('/handler.php', { number: 42 })
  .then((data) => {
    console.log(data.number);
  });

$number = (int)$_POST['number'];
$number += 1;
echo json_encode(['number' => $number]);

.menu {
  opacity: 0; /* по умолчанию скрыто */
}
.menu-opened {
  opacity: 1; /* при добавлении класса - открыто */
}

@media (min-width: 992px) {
  .menu {
    opacity: 1; /* на больших экранах – всегда открыто */
  }
}

//...
burger.classList.toggle('open');
burger.classList == 'open'
  ? menu.classList.add('menu-opened')
  : menu.classList.remove('menu-opened');

$('input[type=text]').change(function(event) {
  let id = event.target.form.id;
  console.log(id);
});

const elements = document.querySelectorAll('.ch')

const show = (Event) => {
   console.log('Навел!');
   // ошибка. elements - коллекция, а element вообще здесь не определен
   elements.classList.add('bgc');
}

elements.forEach(element =>{
   element.addEventListener('mouseover', show)
})

const elements = document.querySelectorAll('.ch')

elements.forEach(element => {
  element.addEventListener('mouseover', event => {
    console.log('Навел!');
    element.classList.add('bgc')
  })
})

const elements = document.querySelectorAll('.ch')

const show = (event, element) => {
  element.classList.add('bgc')
}

elements.forEach(element => {
  element.addEventListener('mouseover', event => {
    show(event, element)
  })
})

const elements = document.querySelectorAll('.ch')

const show = event => {
   event.currentTarget.classList.add('bgc')
}

elements.forEach(element =>{
   element.addEventListener('mouseover', show)
})

document.getElementById('ocf-submit').on("submit", function(e) {
    e.preventDefault();
    ClearCart(document.getElementById('btn-ocf-submit'));
});

document.getElementById('ocf-submit').addEventListener("submit", function(e) {
    e.preventDefault();
    ClearCart(document.getElementById('btn-ocf-submit'));
});

$('.slider-licenzii a')
  .slice(2)
  .addClass('d-none');

for(let i = 0;i<arr.length;i++){
  if (i+1 < arr.length) {
    console.log(arr[i],arr[i + 1])
  }
}

for(let i = 0; i < arr.length - 1; i++){
  console.log(arr[i],arr[i + 1])
}

document.freqform.text.dispatchEvent(new KeyboardEvent("keypress", {
  view: window,
  keyCode: 13,
  bubbles: true,
  cancelable: true
}));