安装：
npm i js-audio-recorder
调用：
import Recorder from 'js-audio-recorder'; let recorder = new Recorder();
基本功能看官网：https://recorder-api.zhuyuntao.cn/
播放时的波形图，一开始没搞出来，后面看了人家的例子，才弄好，这里记录一下：
首先，要用到两个canvas标签
<canvas id="recordCanvas" ref="record"></canvas> <canvas id="playCanvas" ref="play"></canvas>
data() {
return {
recorder: null, // 录音
drawRecordId: null,
drawPlayId: null,
}
},
mounted(){
this.recorder = new Recorder()
},