如何在点击时删除"虚线边框"？

:focus {
  outline: none;
}

a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
  outline: none;
}

a:active,
button:active,
input:active,
textarea:active,
select:active {
  outline: none;
}

document.addEventListener('click', function(event) {
  if (event.target.tagName.toLowerCase() !== 'a' && event.target.tagName.toLowerCase() !== 'button' && event.target.tagName.toLowerCase() !== 'input' && event.target.tagName.toLowerCase() !== 'textarea' && event.target.tagName.toLowerCase() !== 'select') {
    event.target.blur();
  }
});