你看

public add_list(){ //先爬網頁上的資料
    return new Promise((resolve, reject)=>{
      this.httpclient.get("URL")
      .subscribe(res=>{
        if(res["status"]==200){
          let qq:string=JSON.parse(JSON.stringify(res))
          for(let i=0;i<qq["results"].length;i++){
             this.test_three.push({ //這邊是爬網頁上的資料 再PUSH進去
                 ID:qq["results"][i].ID,
                 Name:qq["results"][i].Name,
                 Bitrate:qq["results"][i].Bitrate,
                 Format:qq["results"][i].Format,
                 IsAACEnabled:qq["results"][i].IsAACEnabled,
                 StreamUrl:qq["results"][i].StreamUrl,
                 IsAddedToLove:false,
                 active:false
             })  
          }
        resolve(this.test_three) 
        }
        else{
        reject(this.test_three)
        }
      })
    }).catch(err=>{
      console.log("抓歌曲失敗 "+err)
    })  
  }
  
  public playing_song(){
    return new Promise((resolve, reject)=>{
      let ss:string=this.dp.get_playing_radio();
      console.log(" 歌曲網址 "+ss)
     
        for(let u in this.test_three){
          if(ss==this.test_three[u].StreamUrl){
            let file=JSON.parse(JSON.stringify(this.test_three))
              let index=file.map(d=>{
                return  d["StreamUrl"]
              }).indexOf(ss)
                  console.log("是多少啦~ "+index)
                    this.test_three[index].active=true;
                      //resolve(this.test_three[index].active)
                    resolve(ss)
          }
        }
      
     // reject(this.test_three[index].active)
    })
    // .catch(err=>{
    //   console.log("噁噁噁 沒有歌曲在播"+err)//這邊有沒加入REJECT都沒差
    //  // return err;
    // }) 
  }
  
  public async compair_favorite() {
    try {
      const [playing_song,add_list] = await Promise.all([
        this.playing_song(),//這裡執行失敗也沒差 下面還是會跑
        this.add_list()//這裡不受影響
      ])
    }
    catch (err) {
      console.log('fetch failed', err);
    }
  }
  this.compair_favorite();