创建一个InnerAudioContext，快速切换src，会有多个音乐同时播放，预期只播放一个？

真机才有问题
onReady: function () {
  this.audio = wx.createInnerAudioContext()
},
playAudio (url) {
  this.audio.src = url
  this.audio.play()
}
playAudio (url1)
playAudio (url2)
playAudio (url3)