<a-form-model id="ruleForm" ref="ruleForm" >
    ...
</a-form-model>

let form = this.$refs.ruleForm;
        console.log(form);
        form = document.getElementById('ruleForm');
        console.log(form);
this.$refs.ruleForm


this.$refs.xxx和document.getElementById(xxx)_IT

 

 

document.getElementById('ruleForm')


this.$refs.xxx和document.getElementById(xxx)_IT_02