[рони]

fori,

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<div id="vue">
<input type="number" @keydown="tonum">
</div>
<script>
    var vue = new Vue({
  el: '#vue',
  data: {
  },
  methods: {
    tonum(event) {
     if([187, 189,69].includes(event.keyCode))  event.preventDefault();
    }
  }
})
</script>