JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@1.3.5/lib/index.js"></script>
<div id="app">
<el-form :model="ruleForm2" :rules="rules2" ref="ruleForm2" label-width="120px" class="demo-ruleForm">
  <el-form-item label="Password" prop="pass">
    <el-input type="password" v-model="ruleForm2.pass" auto-complete="off"></el-input>
  </el-form-item>
  <el-form-item label="Confirm" prop="checkPass">
    <el-input type="password" v-model="ruleForm2.checkPass" auto-complete="off"></el-input>
  </el-form-item>
  <el-form-item label="Age" prop="age">
    <el-input v-model.number="ruleForm2.age"></el-input>
  </el-form-item>
  <el-form-item>
    <el-button type="primary" @click="submitForm('ruleForm2')">Submit</el-button>
    <el-button @click="resetForm('ruleForm2')">Reset</el-button>
  </el-form-item>
  Is the form validated ? {{isFormValidated}}
</el-form>
</div>

SCSS

@import url("//unpkg.com/element-ui@1.3.5/lib/theme-default/index.css");

Babel + JSX

var Main = {
    data() {
      var checkAge = (rule, value, callback) => {
        if (!value) {
          return callback(new Error('Please input the age'));
        }
        setTimeout(() => {
          if (!Number.isInteger(value)) {
            callback(new Error('Please input digits'));
          } else {
            if (value < 18) {
              callback(new Error('Age must be greater than 18'));
            } else {
              callback();
            }
          }
        }, 1000);
      };
      var validaePass = (rule, value, callback) => {
        if (value === '') {
          callback(new Error('Please input the password'));
        } else {
          if (this.ruleForm2.checkPass !== '') {
            this.$refs.ruleForm2.validateField('checkPass');
          }
          callback();
        }
      };
      var validaePass2 = (rule, value, callback) => {
        if (value === '') {
          callback(new Error('Please input the password again'));
        } else if (value !== this.ruleForm2.pass) {
          callback(new Error('Two inputs don\'t match!'));
        } else {
          callback();
        }
      };
      return {
        isFormValidated : false,
        ruleForm2: {
          pass: '',
          checkPass: '',
          age: ''
        },
        rules2: {
          pass: [
            { validator: validaePass, trigger: 'blur' }
          ],
          checkPass: [
            { validator: validaePass2, trigger: 'blur' }
          ],
          age: [
            { validator: checkAge, trigger: 'blur' }
          ]
        }
      };
    },
    methods: {
      submitForm(formName) {
        this.$refs[formName].validate((valid) => {
          if (valid) {
            alert('submit!');
          } else {
            console.log('error submit!!');
            return false;
          }
        });
      },
      resetForm(formName) {
        this.$refs[formName].resetFields();
      }
    }
  }
var Ctor = Vue.extend(Main)
new...