Fix crash when load app in head tag

[trananhmanh89]

Environment Info

• Naive UI version: (eg. 2.11.0)
• Browser Info: ( Chome 91)
• System Info: (Windows 10 21H1)

Steps to reproduce

• Create a static html site
• Build a naive app with a nbutton
• Include app js to head of html file
• App crash, nothing show

Solution:

• because app js was included to head, so document.body is null. Use document.createElement('div') instead.

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[07akioni]

Please add changelog to the PR.

[trananhmanh89]

Please add changelog to the PR.

Please tell me how. I don't know.

[07akioni]

Please add changelog to the PR.

Please tell me how. I don't know.

/CHANGELOG.en-US.md <-- add changelog
/CHANGELOG.zh-CN.md <-- add a changelog placeholder, I'll fill it

[trananhmanh89]

Please add changelog to the PR.

Please tell me how. I don't know.

/CHANGELOG.en-US.md <-- add changelog
/CHANGELOG.zh-CN.md <-- add a changelog placeholder, I'll fill it

Hi,
A silly question. How can i add more commits to this PR? Or i have to create new PR for changelog?

[07akioni]

Please add changelog to the PR.

Please tell me how. I don't know.

/CHANGELOG.en-US.md <-- add changelog

/CHANGELOG.zh-CN.md <-- add a changelog placeholder, I'll fill it

Hi,

A silly question. How can i add more commits to this PR? Or i have to create new PR for changelog?

just change files and commit to your branch

[trananhmanh89]

just change files and commit to your branch

Done.