小程序 iOS canvas2d(新)绘图能力性能太差，Worker里面能不能直接操作canvas？
相关文档
- Worker.onProcessKilled: 小程序/开发/API/Worker/Worker/Worker.onProcessKilled
- Worker.terminate: 小程序/开发/API/Worker/Worker/Worker.terminate
- Worker.onProcessKilled#参数: 小程序/开发/API/Worker/Worker/Worker.onProcessKilled
- Worker.onProcessKilled#功能描述: 小程序/开发/API/Worker/Worker/Worker.onProcessKilled
- Worker.postMessage: 小程序/开发/API/Worker/Worker/Worker.postMessage
worker里面没有wx.XXX的api ，如何创建OffscreenCanvas呢？