uniapp下载文件安装

uni.getSystemInfo({
        success: function (res) {
          console.log(res.osName, "系统信息");
          console.log(res, "系统信息1");
          if (res.osName == "android") {
            uni.showLoading({ title: "下载中" });
            uni.downloadFile({
              url: `下载文件的路径/地址`, //仅为示例，并非真实的资源
              success: (res) => {
                console.log(res, "下载成功");
                if (res.statusCode === 200) {
                  console.log("下载成功");
                  uni.hideLoading();
                  uni.showToast({ title: "下载成功", icon: "success" });
                  uni.saveFile({
                    tempFilePath: res.tempFilePath,
                    success: function (res) {
                      uni.openDocument({
                        filePath: res.savedFilePath,
                        success: function (res) {
                          console.log(res, "打开安装包");
                        },
                      });
                    },
                    fail: (err) => {
                      console.log(err, "打开安装包-失败");
                    },
                  });
                }
              },
              fail: (err) => {
                console.log(err, "下载失败");
                uni.hideLoading();
                uni.showToast({
                  title: "下载失败,请检查网络",
                  icon: "none",
                  duration: 1500,
                });
              },
            });
          } else {
            uni.showToast({
              title: "当前手机系统不支持",
              icon: "none",
              mask: true,
            });
          }
        },
      });