研究消息队列处理库amqplib（https://www.npmjs.com/package/amqplib）时，把实例直接拿过来运行的时候报错如下
不知道为什么会出这样的问题，后来跑到github上问了才知道，是因为运行环境我没有配好，没有安装RabbitMQ
RabbitMQ又依赖 Erlang
所以要先安装 Erlang，然后再安装RabbitMQ，这样amqplib的example就可以跑起来了
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