扫码回调结果中,调用音频播放,音频无效

const innerAudioContext = wx.createInnerAudioContext();

onReady:function(e){     this.scan();   },     scan:function(){     let that = this;     wx.scanCode({       onlyFromCamera: true,       success: function (res) {         console.log(res.result);         innerAudioContext.autoplay = true;           innerAudioContext.src = 'data/a.mp3';         innerAudioContext.onPlay(() => {           console.log('开始播放')         })         innerAudioContext.onError((res) => {           console.log(res.errMsg)           console.log(res.errCode)         })         innerAudioContext.onEnded((res) => {           console.log('play2播放结束')         })         console.log(innerAudioContext)       },     });   },

把音频放在回调里面 播放不了