问如何使按钮在某个点之后更改其步骤而不丢失值？

EN

<template>
  <div id="app">
    <input :step="1" type="number" v-model="something" @keydown="keydown" />
    {{ editing }}
  </div>
</template>

<script>
export default {
  name: "App",
  data: function() {
    return {
      something: 0,
      last: 0,
      editing: false
    };
  },
  methods: {
    keydown(e) {
      this.editing = e.key !== "Enter";
      if (!this.editing) {
        this.validateSomething(Number(this.something));
      }
    },
    validateSomething(v) {
      if (v > 5) {
        if (v % 2 === 0) {
          if (v > this.last) {
            this.something = v + 1;
          } else {
            this.something = v - 1;
          }
        }
      }
      this.last = this.something;
    }
  },
  watch: {
    something: function(newVal, oldVal) {
      console.log(newVal, oldVal);
      let v = Number(newVal);
      if (!this.editing) {
        this.validateSomething(v);
      }
    }
  }
};
</script>