vue el-upload上传文件方法

话不多说 直接上代码、

upload
              :action="actionUrl"
              class="avatar-uploader"
              :multiple="false"
              name="files"
              ref="upload"
              :file-list="fileList"
              :on-preview="handlePreview"
              :on-success="handleSuccess"
              :before-upload ="beforeUpload"
              :http-request="httpRequest"
              :on-exceed="handleExceed"
              :on-change="handleChanged"
              accept=".csv,.xls,.xlsx"
              :auto-upload="false"
            >
　　选取文件
　　上传到服务器
　　
只能上传csv/xslx/xsl文件，且不超过1M

actionUrl: `${env.imgCaptchaUrl}**/upload`,
fileList: [],

handleChanged(file,fileList){
      this.fileList = fileList
    },
    handleExceed (file, fileList) {
      console.log(file);
    },
    handleSuccess (res, file) {
      console.log(file);
      console.log(res);
    },
    handlePreview(file){
      console.log(file);
    },
    beforeUpload (file) {
      if (file.size / 1024 / 1024 > 1) {
        Vue.$vux.toast.text('上传文件不超过1M')
        return false
      }
      var ext = file.name.substring(file.name.lastIndexOf('.') + 1)
      const extension =
        ext === 'csv' ||
        ext === 'CSV' ||
        ext === 'xlsx' ||
        ext === 'xls'
      if (!extension) {
        Vue.$vux.toast.text('上传文件格式只能为csv、xlsx/xls')
        return false
      }
    },
    httpRequest (opt) {
      const _this = this
      const file = opt.file
      Vue.$vux.toast.text('文件上传中...')
      var reader = new FileReader()
      reader.readAsDataURL(file)
      reader.onload = function (e) {
        let imgType = ''
        var ext = file.name.substring(file.name.lastIndexOf('.') + 1)
        if (ext === 'csv' ) {
          imgType = 'csv'
        }
        if (ext === 'xlsx' || ext === 'xls') {
          imgType = 'xlsx'
        }
        uploadCsv({
          files: this.result.replace(`data:image/${imgType};base64,`, '')
        })
          .then(res => {
            if (res.errno === 0) {
              Vue.$vux.toast.text('上传成功')
              _this.account.license_url = res.data.url
            }
          })
          .catch(err => {})
      }
    },
    submitUpload(){
      if(this.fileList.length==0){
        this.successDialog = "请先选择文件";
        this.sussAlog = true;
        return
      }
      this.$refs.upload.submit();
    },

onDownload(){
      let start = ""
      let end = ""
      if(this.form.time){
        start =  parseTime(this.form.time[0]);
        end = parseTime(this.form.time[1]);
      }
      delete(this.form.time)
      Object.assign(this.form, { 
        first_time: start, 
        end_time: end ,
      });
      let { 
            first_time,
            end_time,
          } = this.form;
      window.open(this.downUrl+"lm/downloadModel?"+
      "&first_time="+first_time+
      "&end_time="+end_time
      , '_blank');
    },