plus.downloader.createDownload 下载文件监听不到 文件总大小totalSize

let downloadPath = appPath;
uni.showModal({
//提醒用户更新
title: "更新提示",
content: "有新的更新可用，请升级更新！",
showCancel: false, // 隐藏取消按钮
success: (res) => {
if (res.confirm) {
let showLoading = plus.nativeUI.showWaiting("正在下载");
// 用户点击了确认按钮
const dtask = plus.downloader.createDownload(
downloadPath,
{},
(d, status) => {
console.log("----------------statusstatusstatus-----------",status);
const path = (d.filename);
// 下载完成
if (status == 200) {
showLoading.setTitle("安装中，请勿退出！");
// 强制更新
plus.runtime.install(path, { force: true },
function () {
plus.nativeUI.closeWaiting();
uni.showModal({
title: "提示",
content: "安装成功",
showCancel: false, // 隐藏取消按钮
});
console.log("整包更新成功");
plus.runtime.restart();
},
function (e) {
plus.nativeUI.closeWaiting();
uni.showModal({
title: "提示",
content: "整包更新失败",
showCancel: false, // 隐藏取消按钮
});
console.error("整包更新失败，错误原因：" + e);
}
);
} else {
plus.nativeUI.closeWaiting();
uni.showToast({
title: "更新失败",
duration: 1500,
});
}
}
);

                dtask.start(); // 下载任务开始下载  
                dtask.addEventListener("statechanged",  
                  function (task, status) {  
                    console.log("--------------------task---------------", task);  
                    console.log("--------------------task.downloadedSize---------------", task.downloadedSize);  
                    console.log("--------------------task.downloadedSize---------------", task.totalSize);  
                    console.log(  
                      "task.statetask.statetask.state",  
                      parseInt(  
                        (parseFloat(task.downloadedSize) /  
                          parseFloat(task.totalSize)) *  
                          100  
                      )  
                    );  
                    // 给下载任务设置一个监听 并根据状态  做操作  
                    switch (task.state) {  
                      case 1:  
                        // showLoading.setTitle('正在更新');  
                        break;  
                      case 2:  
                        // showLoading.setTitle('已连接到服务器');  
                        break;  
                      case 3:  
                        showLoading.setTitle(  
                          " 正在下载 - " + parseInt((parseFloat(task.downloadedSize) / parseFloat(task.totalSize)) * 100) + "% "  
                        );  
                        break;  
                      case 4:  
                        //下载完成  
                        plus.nativeUI.closeWaiting();  

                        break;  
                    }  
                  }  
                );