<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.5.4/lib/index.js"></script>
<div id="app">
<el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">
  <el-form-item label="" prop="turnTrip">
    <el-input v-model.number="ruleForm.turnTrip" type="number"></el-input>
  </el-form-item>
  <el-form-item label="" prop="initReadings">
     <el-input v-model.number="ruleForm.initReadings" type="number"></el-input>
  </el-form-item>
  <el-form-item>
    <el-button type="primary" @click="submitForm("ruleForm")"></el-button>
    <el-button @click="resetForm("ruleForm")"></el-button>
  </el-form-item>
</el-form>
</div>

var Main = {
    data() {
      return {
        ruleForm: {
          turnTrip: "",
          initReadings: "",
          desc: ""
        },
        rules: {
            turnTrip: [{ required: true, validator:(rule,value,callback)=>{
               if(!value){
                  callback(new Error(""));
              }
               if(value<0){
                     callback(new Error("0"));
               }else{
                     callback();
               }
          }, trigger: "blur" }],
          initReadings: [
            { required: true, message: "", trigger: "change" }
          ],
        }
      };
    },
    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("-sharpapp")

@import url("//unpkg.com/element-ui@2.5.4/lib/theme-chalk/index.css");

https://jsfiddle.net/vx3mftb4/2/