fix(switch): 当beforeChange类型为Promise<void>时 无异常可继续执行

[czq297297]

当beforeChange类型为Promise时 无异常可继续执行  与modal on-before-ok逻辑保持一直

Types of changes

• [ ] New feature
• [ ] Bug fix
• [x] Enhancement
• [ ] Component style change
• [ ] Typescript definition change
• [ ] Documentation change
• [ ] Coding style change
• [ ] Refactoring
• [ ] Test cases
• [ ] Continuous integration
• [ ] Breaking change
• [ ] Others

Background and context

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
Switch	当before-change类型为Promise<void>时 无异常可继续执行	When the before-change type is Promise<void>, the execution can continue without exception

Checklist:

• [ ] Test suite passes (npm run test)
• [ ] Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• [ ] Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to main branch)

Other information