绘制图片，单一绘制都能完成，想做图片重叠，绘制多张图片总是失败
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- CanvasContext.drawImage: 小程序/开发/API/画布/CanvasContext/CanvasContext.drawImage
- CanvasContext.drawImage#参数: 小程序/开发/API/画布/CanvasContext/CanvasContext.drawImage
- CanvasContext.drawImage#功能描述: 小程序/开发/API/画布/CanvasContext/CanvasContext.drawImage
- CanvasContext.drawImage#示例代码: 小程序/开发/API/画布/CanvasContext/CanvasContext.drawImage
- wx.getBLEDeviceCharacteristics: 小程序/开发/API/设备/蓝牙-低功耗中心设备/wx.getBLEDeviceCharacteristics