capture-screen.md

## uni.onUserCaptureScreen(callback?) @onusercapturescreen

<!-- UTSAPIJSON.onUserCaptureScreen.description -->

<!-- UTSAPIJSON.onUserCaptureScreen.compatibility -->

<!-- UTSAPIJSON.onUserCaptureScreen.param -->

<!-- UTSAPIJSON.onUserCaptureScreen.returnValue -->

<!-- UTSAPIJSON.onUserCaptureScreen.tutorial -->

## uni.offUserCaptureScreen(callback?) @offusercapturescreen

<!-- UTSAPIJSON.offUserCaptureScreen.description -->

<!-- UTSAPIJSON.offUserCaptureScreen.compatibility -->

<!-- UTSAPIJSON.offUserCaptureScreen.param -->

<!-- UTSAPIJSON.offUserCaptureScreen.returnValue -->

<!-- UTSAPIJSON.offUserCaptureScreen.tutorial -->

<!-- UTSAPIJSON.general_type.name -->

<!-- UTSAPIJSON.general_type.param -->

## tips
- 本文的截屏指手机自带的截屏事件的监听和取消监听，由用户操作手机按键触发。App平台如需通过代码对view截屏，另见API [takeSnapshot](../dom/unielement.md#takesnapshot)
- 如果想防止截屏，一般是监听到截屏事件后，立即修改当前界面内容，这样即便截屏也截不到你想要保护的内容