我想将AngularJS专案升级成Angular5，并且能透过计时器每隔一段时间刷新页面的数据

以下代码在AngularJS能顺利运行但无法在Angular5中运行

quitTalkingWDT(){
          if(this.talkingWDT){
            $interval.cancel(this.talkingWDT)
            this.talkingWDT = null
            this.wait4DataStartTS = 0
          } 
        }
      
        kickTalkingWDT(){
          this.quitTalkingWDT()
          this.talkingWDT = $interval(function(){
            if (!this.currDevice || (this.wait4DataStartTS === 0)){
              this.quitTalkingWDT()
              return
            }
              this.isStillTalking()
          },500)
        }
    

我改使用setTimeout

quitTalkingWDT(){
       if(this.talkingWDT){
        setTimeout.cancel(this.talkingWDT)
        this.talkingWDT = null
        this.wait4DataStartTS = 0
       } 
      }
    
       kickTalkingWDT(){
      this.quitTalkingWDT()
      this.talkingWDT = setTimeout(function(){
        if (!this.currDevice || (this.wait4DataStartTS === 0)){
          this.quitTalkingWDT()
          return
        }
          this.isStillTalking()
       },500)
      }
      

但setTimeout似乎没有属性'cancel'，请问我该如何解决这个问题呢？