iview的Upload上传前怎么获取上传文件的路径？

Question

1.需求：上传gpx文件到后台，一键，togeojson解析文件获取最高最低点，然后把数据和文件Post到后端，togeojson如何获取文件的路径？
iview的Upload有before-upload方法，参数file里没有文件路径，如何破？

Answer 1

<img :src="fileUrl" width="144px" height="108px" alt="">
<Upload :action="resource" name="uploadFile" :before-upload="handleBeforeUpload" :on-success="handleUploadSuccess" :format="['jpg','jpeg','png']" :on-format-error="handleFileFormatErr" :show-upload-list="false">
     <Button icon="ios-cloud-upload-outline">{{$t('button.button_uploadImg')}}</Button>
</Upload>

主要列出before-upload方法，其他的省略了：

    handleBeforeUpload (file) {
      let promise = new Promise(resolve => {
        this.$nextTick(function () {
          let _this = this
          let reader = new FileReader()
          // תbase64
          reader.onload = function (e) {
            _this.fileUrl = e.target.result // img里可以显示未上传的图片文件以供预览
          }
          reader.readAsDataURL(file)
          resolve(true)
        })
      })
      return promise
    }