vue自定义一个v-model的实现代码

<template>
  <my-form v-model="form">
  </my-form>
</template>
<script>
  export default {
    data() {
      return {
        form: ''
      }
    }
  }
<script>

// my-form组件
<template>
  <form>
    <input v-model="model.val1" />
    <textarea v-model="model.val2"></textarea>
  <form>
</template>
<script>
  export default {
    model: {
      prop: 'model',
      event: 'change'
    },
    props: {
      model: Object
    }
    watch: {
      model(val){
        this.$emit('change', val)
      }
    }
  }
<script>