通过小程序及node实现语音识别
小程序端主要的操作是录音，然后将录音的临时音频文件上传到node后端，让node端进一步操作。
node端要安装fluent-ffmpeg模块
//在你的本机上要安装ffmpeg以及配置相关环境变量
npm install fluent-ffmpeg
var ffmpeg = require('fluent-ffmpeg'); //在JS文件引入同时也要安装百度语音识别接口的SDK
npm install baidu-aip-sdk
var AipSpeechServer=require('baidu-aip-sdk').speech; //在JS文件中引入后面的主要逻辑：
接收前端上传过来的临时音频文件，通过fluent-ffmpeg模块转码后保存到文件夹中，然后再调用百度语音识别接口，进行语音识别。
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