toExport() {

      if (this.dataList == false) {

        this.$createDialog({

          type: "alert",

          content: "数据為空",

          confirmBtn: "確定",

          icon: "cubeic-alert"

        }).show();

      } else {

        var that = this;

        this.$createDialog({

          type: "confirm",

          icon: "cubeic-alert",

          content: "確定導出嗎？",

          confirmBtn: {

            text: "確定",

            active: true,

            disabled: false,

            href: "javascript:;"

          },

          cancelBtn: {

            text: "取消",

            active: false,

            disabled: false,

            href: "javascript:;"

          },

          onConfirm: () => {

            var data = [];

            this.dataList.forEach(x => {

              var datas = x.counter + "," + x.barcode + "," + x.qty + "\n";

              //var datas = x.counter + "," + x.barcode + "," + x.qty;

              data.push(datas);

            });

            //合并数组为字符串

            var temp_string = data.join("");

            //alert(temp_string)

            //alert(window.requestFileSystem)

            window.requestFileSystem(

              LocalFileSystem.PERSISTENT,

              ,

              function(fs) {

                //alert("open: " + fs.name);

                fs.root.getFile(

                  "stocking.txt",

                  { create: true, exclusive: false },

                  function(fileEntry) {

                    //alert(fileEntry);

                    //alert("is file？" + fileEntry.isFile.toString());

                    //文件内容

                    //alert (typeof temp_string)

                    // alert("插入的内容是"+temp_string)

                    var dataObj = new Blob([temp_string], {

                      type: "text/plain"

                    });

                    // var dataObj2 = new Blob(["temp_string"], {

                    //   type: "text/plain"

                    // });

                    //写入文件

                    that.writeFile(fileEntry, dataObj);

                    //that.writeFile(fileEntry, dataObj2);

                  },

                  that.onErrorCreateFile

                );

              },

              that.onErrorLoadFs

            );

          }

        }).show();

      }

      //持久化数据保存

    },

    writeFile(fileEntry, dataObj) {

       var that=this;

      //创建一个写入对象

      fileEntry.createWriter(function(fileWriter) {

        //文件写入成功

        fileWriter.onwriteend = function() {

           that.contents="數據保存成功";

           that.showPopup();

        };

        //文件写入失败

        fileWriter.onerror = function(e) {

          that.contents="數據保存失敗";

           that.showPopup();

        };

        //写入文件

        fileWriter.write(dataObj);

      });

    },