IE和下拉菜单触发弹出窗口阻止程序

select {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

document.querySelector('select').addEventListener('mousedown', function(event) {
  event.preventDefault();
});

$('select').on('mousedown', function(event) {
  event.preventDefault();
});