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希望文档能增加夜间模式

### Version 2.7.14 ### Reproduction link [codesandbox.io](https://codesandbox.io/s/quizzical-grass-85c9zw?file=/src/components/HelloWorld.vue) ### Steps to reproduce https://codesandbox.io/s/quizzical-grass-85c9zw?file=/src/components/HelloWorld.vue ### What is expected? if watch has set flush to 'post', it's callback should be called after dom...

**What kind of change does this PR introduce?** (check at least one) - [x] Bugfix - [ ] Feature - [ ] Code style update - [ ] Refactor -...

**What kind of change does this PR introduce?** (check at least one) - [x] Bugfix - [ ] Feature - [ ] Code style update - [ ] Refactor -...