如上图，请问fail回调什么情况下会执行？
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- wx.onLocalServiceResolveFail: 小程序/开发/API/网络/mDNS/wx.onLocalServiceResolveFail
- wx.offLocalServiceResolveFail: 小程序/开发/API/网络/mDNS/wx.offLocalServiceResolveFail
- UpdateManager.onUpdateFailed: 小程序/开发/API/基础/更新/UpdateManager/UpdateManager.onUpdateFailed
- wx.onLocalServiceResolveFail#参数: 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
已经不行了，请看连接：https://developers.weixin.qq.com/community/develop/doc/0000447a5b431807af57249a551408