switch.md

## switch

<!-- UTSCOMJSON.switch.description -->

<!-- UTSCOMJSON.switch.attrubute -->

<!-- UTSCOMJSON.switch.event -->

<!-- UTSCOMJSON.switch.example -->

<!-- UTSCOMJSON.switch.compatibility -->

<!-- UTSCOMJSON.switch.children -->

<!-- UTSCOMJSON.switch.reference -->