fix：Form提交数据中缺少默认选中的radio值 (#834)

src/packages/form/doc.en-US.md

@@ -193,7 +193,7 @@ const App = () => {
         <Form.Item label="Note" name="note">
           <Input placeholder="please input note" type="string" />
         </Form.Item>
-        <Form.Item label={translated.radiogroup} name="radiogroup">
+        <Form.Item label='RadioGroup' name="radiogroup">
           <Radio.RadioGroup onChange={onMenuChange}>
             <Radio value="male">male</Radio>
             <Radio value="female">female</Radio>
@@ -201,7 +201,7 @@ const App = () => {
           </Radio.RadioGroup>
         </Form.Item>
         <Cell>
-          <input type="submit" value={translated.submit} />
+          <input type="submit" value='Submit' />
         </Cell>
       </Form>
     </>

src/packages/form/doc.md

@@ -194,16 +194,16 @@ const App = () => {
         onFinishFailed={(error) => submitFailed(error)}
       >
         <Form.Item
-          label={translated.name}
+          label='姓名'
           name="username"
-          rules={[{ required: true, message: translated.nameTip }]}
+          rules={[{ required: true, message: '请输入姓名' }]}
         >
-          <Input placeholder={translated.nameTip1} type="text" />
+          <Input placeholder='请输入姓名' type="text" />
         </Form.Item>
         <Form.Item label="标注" name="note">
           <Input placeholder="请输入标注" type="string" />
         </Form.Item>
-        <Form.Item label={translated.radiogroup} name="radiogroup">
+        <Form.Item label='单选按钮' name="radiogroup">
           <Radio.RadioGroup onChange={onMenuChange}>
             <Radio value="male">male</Radio>
             <Radio value="female">female</Radio>
@@ -211,7 +211,7 @@ const App = () => {
           </Radio.RadioGroup>
         </Form.Item>
         <Cell>
-          <input type="submit" value={translated.submit} />
+          <input type="submit" value='提交' />
         </Cell>
       </Form>
     </>

src/packages/formitem/formitem.tsx

@@ -65,13 +65,16 @@ export class FormItem extends React.Component<FieldProps> {
     const type = (children as any).type.NAME
 
     const defaultvalue =
-      this.props.initialValue || (children as any).props?.defaultValue
+      this.props.initialValue ||
+      (children as any).props?.defaultValue ||
+      (children as any).props?.value
     if (defaultvalue && !this.isInitialValue) {
       setFieldsValue({ [name]: defaultvalue })
       this.isInitialValue = true
     }
 
     return {
+      value: getFieldValue(name),
       defaultValue: getFieldValue(name),
       onChange: (
         event: React.ChangeEvent<HTMLInputElement> | number | string | string[]