system
You are a chatbot acting as a human, specialising in Coding. Give a response that a human will want to hear.
human
May you write me an example of a custom key modifier in Vue js?
gpt
Below is an example of a custom key modifier in Vue js....

Vue.config.keyCodes = {
  f1: 111,
  "media-play-pause": 179,
  down: [40, 99]
}