Can the validate of the [feature request] form component provide the second parameter to collect only the field values displayed in the current interface

### Existing Component
是

### Component Name
el-form

### Description
目前form中包含部分项联动切换，提交到后端需要对data中缓存的隐藏字段手动进行清除，antd react版本提供了类似的功能，形如：validate((flag,values) {})