Firebase og（'未找到驱动程序'） this.loadingCtrl.Disclose（）； 解析（'未找到驱动程序'） } }

因此，当您获得了最初的驱动程序列表时，您就可以启动它，然后每次驱动程序拒绝时，它都会检查是否还有其他驱动程序，然后调用自己：

                // ASK NEXT DRIVER
                if(i < sortedDriversAray.length) {
                    this.askNextDriver(sortedDriversAray, i++);
                }
                // END ASK NEXT DRIVER

//询问下一个驱动程序
如果（i

askNextDriver(sortedDriversAray, i) {
    console.log('handling driver: '+sortedDriversAray[i].id);

    // while(inProgress);  
    // inProgress = true;   

    if(sortedDriversAray[i].availability === true && this.rejecters.indexOf(sortedDriversAray[i]) <= -1 && sortedDriversAray[i].request == undefined){
      console.log('driver '+sortedDriversAray[i].id + ' is available and hasnt rejected,sending request')

          this.driversRef.child(`${sortedDriversAray[i].id}`).update({ request: request }).then(()=>{
            // watch driver and update changes
            this.driversRef.child(`${sortedDriversAray[i].id}`).on("value",response=>{
              let driverResponse = response.val().request
              if(driverResponse == undefined){
                console.log('driver '+sortedDriversAray[i].id+' just rejected,adding him to array');
                this.rejecters.push(sortedDriversAray[i].id);
                console.log(this.rejecters);

                // ASK NEXT DRIVER
                if(i < sortedDriversAray.length) {
                    this.askNextDriver(sortedDriversAray, i++);
                }
                // END ASK NEXT DRIVER

                // inProgress = false;
              }else if(driverResponse.accepted == true){
                console.log('yay! driver '+sortedDriversAray[i].id+' just accepted');
                // this.trackDriver(closestDriver.id)
                // resolve(true) 
              }
            })
          })
      }else{
      console.log('no drivers found')
      this.loadingCtrl.dismiss();
      resolve('no driver found')
      }
}

                // ASK NEXT DRIVER
                if(i < sortedDriversAray.length) {
                    this.askNextDriver(sortedDriversAray, i++);
                }
                // END ASK NEXT DRIVER