chore(form): correct form methods usage of demo

[Alex-huxiyang]

• 站点、文档改进
• 演示代码改进

Summary by CodeRabbit

• 新功能

  • 在表单界面中新增提交按钮，改善用户交互体验。
  • 重新构建“字段D”的表单项，增加验证规则，确保用户输入有效数据。

• 改进

  • 优化表单逻辑结构，增强用户体验。

[coderabbitai]

Walkthrough

此次更改增强了Demo3组件的功能，主要通过在表单底部添加一个提交按钮和优化表单项的处理。新按钮使用户能够更方便地提交数据，同时对“字段D”的重新结构化提高了表单的可读性和输入验证。这些改动旨在提升用户体验，确保数据的完整性和逻辑性。

Changes

文件路径	更改摘要
src/packages/form/demos/.../demo3.tsx	1. 在表单底部添加了提交按钮，改善了用户交互。 2. 对“字段D”进行了重构，添加了标签和验证规则，确保输入的有效性。

Poem

🐇 在表单中跳跃，按钮闪亮，
数据输入，乐趣无量。
字段D的新装，清晰辉煌，
用户体验更佳，快乐无疆！ 🌟

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.17%. Comparing base (2993e06) to head (659f749).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2528   +/-   ##
=======================================
  Coverage   83.17%   83.17%           
=======================================
  Files         217      217           
  Lines       17799    17799           
  Branches     2570     2570           
=======================================
  Hits        14805    14805           
  Misses       2989     2989           
  Partials        5        5           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[160905]

可以在这里回复一下你的 核心code吗

[Alex-huxiyang]

可以在这里回复一下你的 核心code吗

const Demo3 = () => {
  return (
    <>
      <Form
        divider
        labelPosition="right"
        footer={
          <>
            <Button nativeType="submit" block type="primary">
              提交
            </Button>
          </>
        }
      >
        <Form.Item label="字段A" name="username" rules={[{ required: true }]}>
          <Input placeholder="请输入字段A" type="text" />
        </Form.Item>
        <Form.Item shouldUpdate noStyle>
          {({ getFieldValue }: FormInstance) => {
            const value = getFieldValue('username')
            if (!value) return null
            return (
              <Form.Item label="字段D" name="age" rules={[{ required: true }]}>
                <TextArea placeholder="字段D" maxLength={100} />
              </Form.Item>
            )
          }}
        </Form.Item>
      </Form>
    </>
  )
}

[160905]

原来是 Form.Item 嵌套 Form.Item