vue el-upload上传文件的示例代码

<el-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"
      >
　　<el-button slot="trigger" size="small">选取文件</el-button>
　　<el-button style="margin-left: 10px;" size="small" type="primary" @click="submitUpload">上传到服务器</el-button>
　　<div slot="tip" class="el-upload__tip">只能上传csv/xslx/xsl文件，且不超过1M</div>
</el-upload>

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');
  },