input = file 实现上传文件

// html
 <input
      style="display: none"
      type="file"
      @change="handleUploadTaskFile"
      ref="fileDom"
    />
// 方法
 const handleUploadTaskFile = async (e) => {
      console.log(e);
      const files = e.target.files;
      if (files && files[0]) {
        const file = files[0];
        let uploadFile = new FormData();
        uploadFile.append("excel", file);
        try {
          const res = await uploadWbsTask(uploadFile);
          requestGetTaskListByProject();
          requesetGetSubProCount();
          ElMessage({
            message: "导入成功",
            type: "success",
          });
        } catch (error) {
          ElMessage({
            message: "导入文件发生错误",
            type: "error",
          });
        }
      }
    };