html部分

 <el-form :model="userInfo" :rules="rules" ref="loginForm">
        <el-form-item prop="name">
          <el-input type="text" v-model="userInfo.username" ></el-input>
        </el-form-item>

        <el-form-item prop="pwd">
          <el-input v-model="userInfo.password" type="password"></el-input>
        </el-form-item>

        <el-form-item>
          <el-checkbox name="type" v-model="userInfo.remember">
            <span>记住密码</span>
          </el-checkbox>
        </el-form-item>
        <el-form-item>
          <el-button type="primary" @click="login('loginForm')">登录</el-button>
        </el-form-item>
      </el-form>

js部分

export default {
    data() {
      return {
        userInfo: {
          username: '',
          password: '',
          remember: false
        },
        rules : {
          name : [
            { required: true, message: '请输入用户名', trigger: 'blur' }
          ],
          pwd : [
            { required: true, message: '请输入密码', trigger: 'blur' }
          ]
        }
      };
    },
    methods: {
      login(formName){
        this.$refs[formName].validate((valid) => {
          if (valid) {
            alert('submit!');
          } else {
            console.log('error submit!!');
            return false;
          }
        });
      }
    }
  };