设置title后即可修复

// music.js

 properties: {

   src: String,

   title: String

 },

// ...省略
      const mMgr = wx.getBackgroundAudioManager()

       mMgr.src = this.properties.src

       mMgr.title = this.properties.title

此外，classic.wxml添加一下：

<v-music 
    wx:if="{{classic.type==200}}" 
    img="{{classic.image}}"
    content="{{classic.content}}"
    title="{{classic.title}}" 
    src="{{classic.url}}" />

注意：可能还会报一个：若需要小程序在退到后台后继续播放音频，你需要在 app.json中配置 requiredBackgroundModes属性，详见: https://developers.weixin.qq.com/miniprogram/dev/framework/config.html#requiredbackgroundmodes 错误

那就在外面的app.json里添加：

"requiredBackgroundModes": [

"audio"

],