之前通过nodejs连接到阿里云物联网mqtt，后又用浏览器连接，总结一下：由于项目是SPA，使用webpack，关键代码：同样使用mqtt.js之前先install：
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提供了实时音视频的核心技术，包括音视频的采集、编解码、网络传输、显示等功能，并且还支持跨平台：windows，linux，mac，android。
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