function handleClear(){
        console.lo
        var scan=document.getElementById("scanId")
        scan.text=""
      }
      
      let scanner = null;
      let callback = null;
      function onmarked(type, result){
          scanner.cancel();
          scanner.close();
          scanner = null;
          console.log('result is' + type + result);
          callback(result);
      }
      function scanCB(){
          console.log('get scan result');
      }
      window.destroyScan = function(){
          scanner.cancel();
          scanner.close();
          scanner = null;
      }
      window.startRecognize = function(cb){
          callback = cb;
          let w = window.innerWidth;
          if(!scanner){
          console.log(1111)
              scanner = new plus.barcode.Barcode('barcode', [], {
                  top: '100px',
                  left: '0px',
                  width: w,
                  height: '500px'
              });
          //plus.barcode.create('barcode', [plus.barcode.QR], 
          // {
        //           top: '100px',
        //           left: '0px',
        //           width: w,
        //           height: '500px'
        //       })
              scanner.onmarked = onmarked;
              plus.webview.currentWebview().append(scanner);
          console.log(1222)
          }
      }