how to fire event on key change in vue js code example

Example 1: enter key vue

<!-- only call `vm.submit()` when the `key` is `Enter` -->
<input v-on:keyup.enter="submit()">
<input @keyup.enter="submit()">
vue

Example 2: vue js button click

<div id="example-2">
  <!-- `greet` is the name of a method defined below -->
  <button v-on:click="greet">Greet</button>
</div>