手机型号:小米10s Xiaomi-M2102J2SC M2102J2SCarm64-v8a

pre_show: function (src, name, callback = false) {
  // console.log(src);
  // console.log(name);
  // console.log(callback);
  if (!(src && name)) {
    return false;
  }
  wx.showLoading({
    title: "下载中...",
    mask: true,
  });
  var fs = wx.getFileSystemManager();
  var df = wx.downloadFile({
    url: src,
    // filePath: `${wx.env.USER_DATA_PATH}/${name}`,
    success: function (params) {
      // console.log(params);
      if (params.statusCode === 200) {
        // 重新改写文件后缀
        fs.saveFile({
          tempFilePath: params.tempFilePath,
          // wx.env.USER_DATA_PATH 是微信提供了一个用户文件目录给开发者，开发者对这个目录有完全自由的读写权限
          filePath: `${wx.env.USER_DATA_PATH}/${name}`,
          success: function (params2) {
            // console.log(params2);
            // console.log(params2.savedFilePath) // params2.savedFilePath 为一个本地缓存文件路径
            var src_arr = src.split(".");
            var ext = src_arr[src_arr.length - 1].toLowerCase();
            // console.log(ext);
            if (callback != false) {
              callback();
            }
            if (["gif", "jpg", "jpeg", "png", "bmp"].indexOf(ext) !== -1) {
              if (callback != false) {
                // 保存图片
                wx.saveImageToPhotosAlbum({
                  filePath: params2.savedFilePath,
                  complete: function (params4) {
                    // console.log(params4);
                    wx.hideLoading();
                    df.offProgressUpdate();
                  },
                  success: function (params4) {
                    wx.showToast({
                      title: "图片已保存",
                      mask: true,
                    });
                  },
                  fail: function (params4) {
                    wx.showToast({
                      title: "图片保存失败",
                      mask: true,
                      icon: "none",
                    });
                  },
                });
              } else {
                wx.previewImage({
                  urls: [src],
                  complete: function (params4) {
                    // console.log(params4);
                    wx.hideLoading();
                    df.offProgressUpdate();
                  },
                })
              }
            } else {
              wx.openDocument({
                filePath: params2.savedFilePath,
                showMenu: true,
                complete: function (params4) {
                  // console.log(params4);
                  wx.hideLoading();
                  df.offProgressUpdate();
                },
                success: function (params4) {
                  wx.showToast({
                    title: "文件已打开",
                    mask: true,
                  });
                },
                fail: function (params4) {
                  wx.showToast({
                    title: "文件打开失败",
                    mask: true,
                    icon: "none",
                  });
                },
              })
            }


          },
        });
      }


    },
  });


  df.onProgressUpdate(function (params) {
    // console.log(params);
    // wx.showLoading({
    //   title: "下载中..." + params.progress + "%",
    //   // title: JSON.stringify(params),
    //   mask: true,
    // });
    wx.showToast({
      title: JSON.stringify(params),
      mask: true,
      icon: "none",
    });
  });


},