问第二次尝试clearTimeout执行失败

EN

handleCheckSensor(){
  if(CancelTimeout){
    clearTimeout(CancelTimeout)
  }
  this.setState({displayGraphs: false})
  this.setState({message: null, error: null})
  const user = this.state.user[0]
  this.pubnub.subscribe({
    channels: [user.channel],
    withPresence: true,
  })
  const CancelPubNub = () => {
    this.setState({isCheckingSensor: false, error: "your request timed out. It appears device did not respond."})
    this.pubnub.unsubscribe({
      channels: [user.channel],
    })
  }

  const CancelTimeout = setTimeout(CancelPubNub, 15000);


  this.pubnub.getMessage(user.channel, (message) => {
    clearTimeout(CancelTimeout)
    this.setState({message: message, isCheckingSensor: false})

  }) 

... }