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="ruleForm" :rules="rules" ref="ruleForm" label-width="120px" class="demo-ruleForm">
  <el-form-item label="Phone" prop="phone">
    <el-input v-model="ruleForm.phone"></el-input>
  </el-form-item>

  <el-form-item>
    <el-button type="primary" @click="submitForm('ruleForm')">Create</el-button>
    <el-button @click="resetForm('ruleForm')">Reset</el-button>
  </el-form-item>
</el-form>
</div>

SCSS

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

Babel + JSX

var Main = {
    data() {
      return {
      phoneMandatory: false,
        ruleForm: {
          phone: '',
        },
        rules: {
          phone: [
            {required: this.phoneMandatory, message: 'Please input phone', 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 Ctor().$mount('#app')