@keyframes pulseError {
  0% { box-shadow: 0 0 0px red; }
  50% { box-shadow: 0 0 8px red; }
  100% { box-shadow: 0 0 0px red; }
}

.input-error {
  animation: pulseError 0.2s ease-in-out 0s 2; /*播放两次*/
  border-color: red;
  outline: none;
  box-shadow: 0 0 0 2px rgba(255, 0, 0, 0.3);
}