uni-app uni-file-picker 上传组件实战应用

<!-- 导入---------------------------------------- -->
<uni-file-picker 
limit="1" 
:file-extname="fmt" 
file-mediatype="all" 
:disabled="percent < 100"
:auto-upload="false" 
@select="beforeUpload"
>
  <button 
    type="primary" 
    size="mini" 
    :disabled="percent < 100"> 
        {{ 100 > percent ? percent + "%" : "导入数据" }}
    </button>
</uni-file-picker>

// 上传----------------------------------------
headers: {
  token: uni.getStorageSync('token'), //获取token(注意仔细看后端接受token的字段名是不是叫做“token”)
},
actionUrl: `${this.$d.API_ROOT_URL}/XXX/XXX`,
fmt: ["xls", "xlsx"],
dur: 100,
percent: 100,
// ----------------------------------------

// 上传文件----------------------------------------------------------------
showFakeLoading() {
  this.interval && clearInterval(this.interval);
  this.percent = 0;
  this.interval = setInterval(() => {
    this.percent++;
    this.percent >= 99 && clearInterval(this.interval);
  }, this.dur);
},
hideFakeLoading() {
  this.interval && clearInterval(this.interval);
  this.percent = 100;
},
//文件上传之前
beforeUpload(e) {
  const filePath = e.tempFilePaths[0];
  const file = e.tempFiles[0];
  //获取图片临时路径
  uni.uploadFile({
    url: this.actionUrl, //【必填】图片上传地址
    filePath, //【必填】（files和filePath选其一）要上传文件资源的路径。
    name: 'file', //【必填】上传名字，注意与后台接收的参数名一致
    header: this.headers, //设置请求头
    //请求成功，后台返回自己服务器上的图片地址
    success: d => {
      d = JSON.parse(d.data)
      // 上传成功了
      if (d.success) {
        let response = d;
        if (response.data && response.data.key) {
          // 下载失败原因的描述文件
          this.$d.customer_downloadImportCustomerExcel({
            key: response.data.key
          }, {
            s: (d) => {
              this.$g.downloadFile(d, `${file.name}-上传失败原因`, '.xls');
              uni.showToast({
                icon: `none`,
                title: `${file.name}-上传失败，请查看失败原因`
              });
              setTimeout(() => {
                this.initList(true); //刷新列表
              }, 1500);
              //console.log('上传失败', response, file, fileList);
            }
          });
        } else if (response.success) {
          // 上传成功了
          uni.showToast({
            icon: `none`,
            title: `“${file.name}”导入成功`
          });
          setTimeout(() => {
            this.initList(true); //刷新列表
          }, 1500);
          //console.log('上传成功', response, file, fileList);
        } else {
          // 其他失败原因
          uni.showToast({
            icon: `none`,
            title: response.msg
          });
          //console.log('上传失败', response, file, fileList);
        }
      } else {
        uni.showToast({
          icon: `none`,
          title: d.msg
        });
      }
    }
  });
},
// ----------------------------------------