form表单无法获取到值

理论上，目前引擎定义的获取指定组件的 API，只有 this.$(refId) 来获取组件的 ref，然后就是调用 ref 对应的方法了~

此例中，获取 ref 可以得到如下对象


BUT
getValue / getValues 确实得不到值，应该是组件实现有点问题，ProForm 没开源

这个什么时候能修复呢

Start by reproducing the form case through this.$(refId), then inspect the returned ref and the behavior of getValue and getValues. The issue identifies ProForm as the affected component but provides no source file or test; done means the relevant form value APIs return the expected values.

Written by the indexing model from the issue text.