fix(BasicForm): 修复表单项通过ifShow控制隐藏后其表单值还存在

[zwtvip]

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[wangjue666]

这个存疑不算bug, 至少在我这边业务场景下， ifshow隐藏后，还需要传值的必要， 先开个issue讨论下吧，记得有类似的issue

[zwtvip]

这个存疑不算bug, 至少在我这边业务场景下， ifshow隐藏后，还需要传值的必要， 先开个issue讨论下吧，记得有类似的issue

@wangjue666 想要隐藏后传值可以用show,ifshow代表不渲染表单项，我的理解是不应该出现这个field

[wangjue666]

ifshow和show场景 我的用法是在一些自定义组件上，渲染吃力就用ifshow, 可以提个issue再探讨下这个问题~

[wangjue666]

在formconfig配置项做成一个是否启用的开关，是比较合适的情形，这样对业务侵入性小