<text catchtap="handleDownload" data-link="{{item.link}}">下载</text>

 //下载
  handleDownload(e) {
    let link = e.currentTarget.dataset.link;
    let fileName = new Date().valueOf();
    wx.downloadFile({
      url: link,
      filePath: wx.env.USER_DATA_PATH + \'/\' + fileName + \'.mp4\',
      success: res => {
        console.log(res);
        let filePath = res.filePath;
        wx.saveVideoToPhotosAlbum({
          filePath,
          success: file => {
            $Message({
              content: \'下载成功\',
              type: \'success\'
            })
            let fileMgr = wx.getFileSystemManager();
            fileMgr.unlink({
              filePath: wx.env.USER_DATA_PATH + \'/\' + fileName + \'.mp4\',
              success: function(r) {

              },
            })
          },
          fail: err => {
            console.log(err)
            if (err.errMsg === \'saveVideoToPhotosAlbum:fail auth deny\') {
              wx.showModal({
                title: \'提示\',
                content: \'需要您授权保存相册\',
                showCancel: false,
                success: data => {
                  wx.openSetting({
                    success(settingdata) {
                      if (settingdata.authSetting[\'scope.writePhotosAlbum\']) {
                        wx.showModal({
                          title: \'提示\',
                          content: \'获取权限成功,再次点击下载即可保存\',
                          showCancel: false,
                        })
                      } else {
                        wx.showModal({
                          title: \'提示\',
                          content: \'获取权限失败，将无法保存到相册哦~\',
                          showCancel: false,
                        })
                      }
                    },
                  })
                }
              })
            }
          }
        })
      }
    })
  },