如何使用Vue表单处理实现表单的状态管理

<template>  <div>    <input type="text" v-model="username" />    <p>用户名：{{ username }}</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p>  </div></template><script>export default {  data() {    return {      username: ''    }  }}</script>

<template>  <div>    <input type="text" v-model="username" />    <span v-if="!validUsername">用户名格式不正确</span>    <button @click="submit">提交</button>  </div></template><script>export default {  data() {    return {      username: ''    }  },  computed: {    validUsername() {      // 校验逻辑，返回true或false      // 比如：用户名必须为3-10位字母或数字      const reg = /^[A-Za-z0-9]{3,10}$/      return reg.test(this.username)    }  },  methods: {    submit() {      if (this.validUsername) {        // 校验通过，执行提交操作        // ...      }    }  }}</script>

<template>  <div>    <InputField v-model="username" :validator="validUsername" label="用户名" />    <span v-if="!validUsername">用户名格式不正确</span>    <SubmitButton :disabled="!validUsername" @submit="submit" />  </div></template><script>import InputField from './InputField.vue'import SubmitButton from './SubmitButton.vue'export default {  components: {    InputField,    SubmitButton  },  data() {    return {      username: ''    }  },  computed: {    validUsername() {      const reg = /^[A-Za-z0-9]{3,10}$/      return reg.test(this.username)    }  },  methods: {    submit() {      // 执行提交操作      // ...    }  }}</script>