wx.canvasGetImageData()报错 canvasGetImageData:fail fail canvas is empty 延迟也设置了，加入this也无用
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- wx.offLocalServiceResolveFail: 小程序/开发/API/网络/mDNS/wx.offLocalServiceResolveFail
- wx.onLocalServiceResolveFail: 小程序/开发/API/网络/mDNS/wx.onLocalServiceResolveFail
- wx.offLocalServiceResolveFail#参数: 小程序/开发/API/网络/mDNS/wx.offLocalServiceResolveFail
- wx.onLocalServiceResolveFail#参数: 小程序/开发/API/网络/mDNS/wx.onLocalServiceResolveFail
- wx.offLocalServiceResolveFail#功能描述: 小程序/开发/API/网络/mDNS/wx.offLocalServiceResolveFail
请具体描述问题出现的流程，并提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。