Backtop doesn't work on mobile

[hdtopku]

• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

Version

3.2.5

Environment

华为手机自带浏览器，鸿蒙系统2.0

Reproduction link

https://www.antdv.com/components/back-top-cn

Steps to reproduce

移动端直接打开：https://www.antdv.com/components/back-top-cn 然后往下翻，backtop不显示

What is expected?

移动端也能显示出来

What is actually happening?

移动端未能显示出来

[github-actions[bot]]

Hello @hdtopku. We totally like your proposal/feedback, welcome to send us a Pull Request for it. Please send your Pull Request to proper branch, fill the Pull Request Template here, provide changelog/TypeScript/documentation/test cases if needed and make sure CI passed, we will review it soon. We appreciate your effort in advance and looking forward to your contribution!

你好 @hdtopku，我们完全同意你的提议/反馈，欢迎直接在此仓库创建一个 Pull Request 来解决这个问题。请将 Pull Request 发到正确的分支，务必填写 Pull Request 内的预设模板，提供改动所需相应的 changelog、TypeScript 定义、测试用例、文档等，并确保 CI 通过，我们会尽快进行 Review，提前感谢和期待您的贡献。

[tangjinzhou]

手中设备未复现问题，如果方便，你可以尝试定位问题并提交 PR， 谢谢

[hdtopku]

确实，我用iphone6s是出现了，华为mate30pro，鸿蒙2.0系统，不管是微信还是自带浏览器中打开都出现不了。

---Original--- From: @.> Date: Tue, Jun 7, 2022 10:53 AM To: @.>; Cc: @.**@.>; Subject: Re: [vueComponent/ant-design-vue] Backtop doesn't work on mobile (Issue #5673)

手中设备未复现问题，如果方便，你可以尝试定位问题并提交 PR， 谢谢

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[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[github-actions[bot]]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.