wx.createOffscreenCanvas不能在worker里调用，new OffscreenCanvas也不行，那怎么在worker里创建一个canvas呢？wx.createOffscreenCanvas这个方法存在的目的是什么呢？
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- Worker.terminate: 小程序/开发/API/Worker/Worker/Worker.terminate
- Worker.onProcessKilled: 小程序/开发/API/Worker/Worker/Worker.onProcessKilled
- Worker.postMessage: 小程序/开发/API/Worker/Worker/Worker.postMessage
- Worker.onProcessKilled#参数: 小程序/开发/API/Worker/Worker/Worker.onProcessKilled
- Worker.terminate#功能描述: 小程序/开发/API/Worker/Worker/Worker.terminate