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未捕获的类型错误：无法读取null 的属性“getTracks” - 堆栈内存 ...

and i got "Uncaught TypeError: Cannot read property 'getTracks' of null" this error from callee.js我从callee.js 得到了“Uncaught TypeError: Cannot read ...

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查詢 「getTracks」的人也找了：

  1. getTracks
    2.
  2. Getvideotracks
    3.
  3. MediaStream
    4.
  4. getAudioTracks
    5.
  5. MediaStreamTrack
    6.
  6. MediaStreamTrack getSources
    7.
  7. MediaStream addtrack
    8.
  8. Removetrack
    9.