在javascript中匹配event.keyCode时如何避免幻数

const KEY_CODE_ENTER = 13;
const KEY_CODE_ESCAPE = 27;

document.addEventListener('keydown', (event) => {
  switch (event.keyCode) {
    case KEY_CODE_ENTER:
      console.log('Enter key pressed');
      break;
    case KEY_CODE_ESCAPE:
      console.log('Escape key pressed');
      break;
    default:
      console.log('Unknown key pressed');
  }
});