animation-frame.md

### requestAnimationFrame(callback)@requestanimationframe

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### cancelAnimationFrame(taskId) @cancelanimationframe

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**提示**
- requestAnimationFrame/cancelAnimationFrame 为全局 API，如果需要跨平台处理 canvas 动画应使用 [uni.createCanvasContextAsync]("./create-canvas-context-async.md")
- `Android uni-app x` requestAnimationframe 目前仅支持有参数callback，示例：`requestAnimationFrame((timestamp : number) => {})`