docs: update time bar demo

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Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Description of change

修复 #3085 中反馈的 DEMO 问题

[github-actions]

😭 Deploy PR Preview fd8ab1f failed. Build logs

_{🤖 By surge-preview}

[coveralls]

Pull Request Test Coverage Report for Build 407850646

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 93.38%

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Totals
Change from base Build 399768748:	0.006%
Covered Lines:	10673
Relevant Lines:	11084

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💛 - Coveralls