animation-frame.md

### requestAnimationFrame(callback)@requestanimationframe

<!-- UTSJSON.Global.requestAnimationFrame.description -->

<!-- UTSJSON.Global.requestAnimationFrame.param -->

<!-- UTSJSON.Global.requestAnimationFrame.returnValue -->

<!-- UTSJSON.Global.requestAnimationFrame.test -->

<!-- UTSJSON.Global.requestAnimationFrame.compatibility -->

<!-- UTSJSON.Global.requestAnimationFrame.tutorial -->

### cancelAnimationFrame(taskId) @cancelanimationframe

<!-- UTSJSON.Global.cancelAnimationFrame.description -->

<!-- UTSJSON.Global.cancelAnimationFrame.param -->

<!-- UTSJSON.Global.cancelAnimationFrame.returnValue -->

<!-- UTSJSON.Global.cancelAnimationFrame.test -->

<!-- UTSJSON.Global.cancelAnimationFrame.compatibility -->

<!-- UTSJSON.Global.cancelAnimationFrame.tutorial -->

**提示**
- requestanimationframe/cancelanimationframe 为全局 API，如果需要跨平台处理 canvas 动画需要使用 [uni.createCanvasContextAsync]("./create-canvas-context-async.md")