vue element实现多个Formt表单同时验证

<el-form   ref="form1"></el-form>
<el-form   ref="form2"></el-form>
<el-form   ref="form3"></el-form>
<el-form   ref="form4"></el-form>
export default{
    data(){
        resultArr:[],//接受验证返回结果数组
        formArr:['form1','form2','form3','form4'],//存放表单ref数组
    }，
    methods:{
        //封装验证函数
        checkForm(formName){
            let _self=this;
            _self.resultArr = []
            let result = new Promise(function(resolve, reject) {
            _self.$refs[formName].validate((valid) => {
                if (valid) {
                    resolve();
                } else { reject() }
                })
            })
            _self.resultArr.push(result) //push 得到promise的结果
        },
        submit(){
            let _self=this;
            _self.formArr.forEach(item => { //根据表单的ref校验
                _self.checkForm(item)
            })
           //resultArr数组的值必须是promise对象才能使用Promise.all，在checkForm做了这一步
            Promise.all(_self.resultArr).then(function() { //都通过了
              alert('所有表单验证通过')
              // 该区域使用this无效，promise内面的this表示局部，并不代表VueComponet实例
            }).catch(function() {
                console.log("err");
            });
        }
    }
}

onSubmit() {
    let _self=this
    return new Promise((resolve, reject) =>{
        _self.$refs.form.validate(valid => {
            if (valid) { // 检验成功 传当前表单的数据
                resolve({0:_self.form})
            } else {
                this.$message.error('员工自选-清单需求，请按要求填写')
                reject()
            }
        })
    })
},

<!-- 方案需求 -->
<div v-show="active === 2">
    <FormEmployeeList ref="Form0"></FormEmployeeList>
    <FormEmployeeGift ref="Form1"></FormEmployeeGift>
    <FormEmployeeCustomization ref="Form2"></FormEmployeeCustomization>
    <FormEnterprisesList ref="Form3"></FormEnterprisesList>
    <FormEnterprisesGift ref="Form4"></FormEnterprisesGift>
    <FormEnterprisesCustomization ref="Form5"></FormEnterprisesCustomization>
</div>

onSubmit() {
    let  newArr = [] //承接promise的返回结果
    for (let v = 0; v < 6; v ++) {
        let res =this.$refs['Form' + v].onSubmit()
        newArr.push(res)
    }
    Promise.all(newArr).then(res => { //都通过了
    	console.log('res',res)
        //res是数组，需转对象
        let obj = Object.assign({},...res)
        this.form = obj
        console.log('大功告成',this.form)
    }).catch(err=> {
        console.log('err',err)
    })
},