用的是官方demo mqtt-demo
https://ext.dcloud.net.cn/plugin?id=854
17:54:29.535 正在同步手机端程序文件...
17:54:29.723 同步手机端程序文件完成
17:54:30.833 正在启动HBuilder调试基座...
17:54:31.857 应用【mqtt-test】已启动
17:54:32.614 App Launch at App.vue:4
17:54:32.617 App Show at App.vue:7
17:54:34.487 [JS Framework] Failed to execute the callback function:
TypeError: cb is not a function
