模态不隐藏在ipad中

Question

我有一个模式问题，该模式不会隐藏在ipad设备中，但在PC浏览器中可以正常工作。因此，我寻求您的帮助。

php

    <div class="modal" id="modal_search">
      <form action="search.php" method="post" class="formSearch">
        <input type="text" name="search" class="inputSearch" placeholder="Search.....">
        <button type="submit" class="botonSearch"><i class="fa fa-search"></i></button>
      </form>
    </div>

JS

var modalSearch = document.getElementById('modal_search');

var botonModalSearch = document.getElementById('btn-search');

botonModalSearch.addEventListener('click', showmodal);

window.addEventListener('click', clickclose);

function showmodal(){
    modal_search.style.display = 'block';
}

function clickclose(e){
   if (e.target == modalSearch ) {
   modalSearch.style.display = 'none';
   }
}