scan(event) {
     BarcodeScanner.scan().then((data) => {
         this.barcodeData = data;
     }, (error) => {
         console.log("Error: ", error);
     })
 }

 scanCode() {
   BarcodeScanner.scan().then((barcodeData) => {
     if (barcodeData.cancelled !== 1) {
       this.dataStore.checkHistory(barcodeData.text).then((data) => {
         var isDuplicate = (data.res.rows.length > 0);
         this.local.get(OPTIONS_KEY_NAME).then((res) => {
           let options = JSON.parse(res) || {};
           if (options.ignoreDuplicateScans && isDuplicate) {
             let alert = this.alerts.create({
               title: 'Duplicate Entry',
               subTitle: 'This scan has been ignored.',
               buttons: ['Dismiss']
             });
             alert.present();
           }
           else {
             this.fetchItem(barcodeData);
           }
         });
       });
     }
   }, (err) => {
     let alert = this.alerts.create({
       title: 'Scan Error',
       subTitle: err,
       buttons: ['Dismiss']
     });
     alert.present();
   });
 }

 this.platform.ready().then(() => {
   BarcodeScanner.scan().then((barcodeData) => {
     //this.test = JSON.stringify(barcodeData);
   }, function (error) {
     //this.test = 'error : ' + error;
   })
 })

 private scan() {
   BarcodeScanner.scan().then((barcodeData) => {
     this.isbn = barcodeData.text;
     this.searchBook();
   }, (err) => {
     console.error('une erreur est interceptée', err)
   });
 }

 //通过扫描二维码登陆
 loginForQR(){
   BarcodeScanner.scan().then((barcodeData) => {
     this.accesstoken=barcodeData.text;
     this.login();
     }, (err) => {
       alert("调用本地相机失败！");
     });
 }

  scan() {
    BarcodeScanner.scan().then(barcodeData => {

      this.barcodeData = barcodeData;

    }, (err) => {
      console.log(err);
    });
  }

  //通过扫描二维码登陆
  loginForQR(){
// 问题是，扫描后，accesstoken如何写入input
    BarcodeScanner.scan().then((barcodeData) => {
      this.accesstoken=barcodeData.text;
      this.login();
      }, (err) => {
          // An error occurred
      });
  }

 scan(){
     BarcodeScanner.scan().then(
         barcodeData=>{
             this.data = barcodeData;
         },
         err=>{
             this.data = 'There was an error:'+err;
         }
     );
 }

 startScan() {
    return BarcodeScanner.scan().then(
     (result) => {
       console.log(result);
     },
     (error) => {
       console.log(error);
     }
   )
 }

        this.platform.ready().then(() => {
            BarcodeScanner.scan().then((result) => {
                if (!result.cancelled) {
					this.barcodeText = result.text;
					this.barcodeFormat = result.format;
					this.scanningDone({'text':result.text,'format':result.format});
				}
            }, (error) => {
            	console.log('error when scanning product barcode');
            });
        });