如何安装先前版本的vee-validate？

npm install vee-validate@版本号

import { extend } from 'vee-validate';
import { required, email } from 'vee-validate/dist/rules';

Vue.use(VeeValidate);

// 自定义验证规则
extend('required', {
  ...required,
  message: '此字段为必填项'
});
extend('email', {
  ...email,
  message: '请输入有效的邮箱地址'
});

<template>
  <form @submit.prevent="submitForm">
    <label for="name">姓名：</label>
    <input v-model="name" v-validate="'required'" name="name" type="text" />

    <label for="email">邮箱：</label>
    <input v-model="email" v-validate="'required|email'" name="email" type="email" />

    <button type="submit">提交</button>
  </form>
</template>

methods: {
  submitForm() {
    this.$validator.validateAll().then(result => {
      if (result) {
        // 验证通过，执行提交逻辑
        console.log('表单验证通过');
      } else {
        // 验证不通过，提示错误信息
        console.log('表单验证不通过');
      }
    });
  }
}