wx.createInnerAudioContext()

const innerAudioContext = wx.createInnerAudioContext()
innerAudioContext.autoplay = trueinnerAudioContext.src = 'http://ws.stream.qqmusic.qq.com/M500001VfvsJ21xFqb.mp3?guid=ffffffff82def4af4b12b3cd9337d5e7&uin=346897220&vkey=6292F51E1E384E061FF02C31F716658E5C81F5594D561F2E88B854E81CAAB7806D5E4F103E55D33C16F3FAC506D1AB172DE8600B37E43FAD&fromtag=46'innerAudioContext.onPlay(() => {    console.log('开始播放')
})
innerAudioContext.onError((res) => {    console.log(res.errMsg)    console.log(res.errCode)
})

上面是官方例子，没有console结果，因为src属性为空。求解这是为啥？怎么解决？