npm install vee-validate --save

import VeeValidate, { Validator } from 'vee-validate'
import zh_CN from 'vee-validate/dist/locale/zh_CN';

Validator.localize('zh_CN', zh_CN)
Vue.use(VeeValidate)

const formatFileSize = function (size) {
 let units = ['Byte', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
 let threshold = 1024;
 size = Number(size) * threshold;
 let i = size === 0 ? 0 : Math.floor(Math.log(size) / Math.log(threshold));
 return (((size / Math.pow(threshold, i)).toFixed(2) * 1) + " " + (units[i]));
}
Validator.localize('zh_CN', {
 name: 'zh_CN',
 attributes: {}
 messages: {
  _default: () => `${fieldName}無效`,
  after: (field, [target]) => `${fieldName}必須在${target}之后`,
  alpha_dash: () => `${fieldName}能夠包含字母數(shù)字字符、破折號和下劃線`,
  alpha_num: () => `${fieldName}只能包含字母數(shù)字字符`,
  alpha_spaces: () => `${fieldName}只能包含字母字符和空格`,
  alpha: () => `${fieldName}只能包含字母字符`,
  before: (field, [target]) => `${fieldName}必須在${target}之前`,
  between: (field, [min, max]) => `${fieldName}必須在${min}與${max}之間`,
  confirmed: (field, [confirmedField]) => `${fieldName}不能和${confirmedField}匹配`,
  credit_card: () => `${fieldName}格式錯誤`,
  date_between: (field, [min, max]) => `${fieldName}必須在${min}和${max}之間`,
  date_format: (field, [format]) => `${fieldName}必須符合${format}格式`,
  decimal: (field, [decimals = '*'] = []) => `${fieldName}必須是數(shù)字，且能夠保留${decimals === '*' ? '' : decimals}位小數(shù)`,
  digits: (field, [length]) => `${fieldName}必須是數(shù)字，且精確到${length}位數(shù)`,
  dimensions: (field, [width, height]) => `${fieldName}必須在${width}像素與${height}像素之間`,
  email: () => `${fieldName}不是一個有效的郵箱`,
  ext: () => `${fieldName}不是一個有效的文件`,
  image: () => `${fieldName}不是一張有效的圖片`,
  included: () => `${fieldName}不是一個有效值`,
  integer: () => `${fieldName}必須是整數(shù)`,
  ip: () => `${fieldName}不是一個有效的地址`,
  length: (field, [length, max]) => {
   if (max) {
    return `${fieldName}長度必須在${length}到${max}之間`
   }
   return `${fieldName}長度必須為${length}`
  },
  max: (field, [length]) => `${fieldName}不能超過${length}個字符`,
  max_value: (field, [max]) => `${fieldName}必須小于或等于${max}`,
  mimes: () => `${fieldName}不是一個有效的文件類型`,
  min: (field, [length]) => `${fieldName}必須至少有${length}個字符`,
  min_value: (field, [min]) => `${fieldName}必須大于或等于${min}`,
  excluded: () => `${fieldName}不是一個有效值`,
  numeric: () => `${fieldName}只能包含數(shù)字字符`,
  regex: () => `${fieldName}格式無效`,
  required: () => `${fieldName}不能為空`,
  size: (field, [size]) => `${fieldName}必須小于${formatFileSize(size)}`,
  url: () => `${fieldName}不是一個有效的url`
 }
})
Vue.use(VeeValidate)

<van-field
 :error="..."
 :error-message="..."
/>

<van-field
 ...
 name="title"
 v-validate="'required|max:20'"
 :error="errors.has('title')"
 :error-message="errors.first('title')"
/>

this.$validator.validateAll().then((result) => {
 if(result){
  // ...
 }
})

<van-field
 name="title"
 data-vv-scope="group-1"
 v-validate="'required|max:20'"
 :error="errors.has('group-1.title')"
 :error-message="errors.first('group-1.title')"
/>

this.$validator.validateAll('group-1').then((result) => {
 if(result){
  // ...
 }
})