<template>
  <div>
    <input
      v-for="input in inputs"
      :key="input.id"
      type="number"
      v-model="input.text"
    >
    <button @click="addInput">+</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      inputs: [
        {
          id: 1,
          text: ""
        }
      ]
    };
  },
  methods: {
    addInput() {
      this.inputs.push({
        id: this.inputs.length + 1,
        text: ""
      });
    }
  }
};
</script>