1.网络下载可能会没有总长度返回，这里需要额外处理，避免出问题

Signed-off-by: zhoulisheng1 <zhoulisheng1@huawei.com>

imageknife/src/main/ets/components/imageknife/networkmanage/DownloadClient.ets

@@ -46,9 +46,12 @@ export class DownloadClient implements IDataFetch {
         loadTask = downloadTask;
 
         loadTask.on('progress', (receivedSize, totalSize) => {
-          let percent = Math.round(((receivedSize * 1.0) / (totalSize * 1.0)) * 100)
-          if (request.progressFunc) {
-            request.progressFunc(percent);
+          if(totalSize > 0) {
+            // 并不是所有服务器都会返回totalSize 当没有文件大小的时候,下载进度没有百分比回调,只能知道目前下载了多少数据量
+            let percent = Math.round(((receivedSize * 1.0) / (totalSize * 1.0)) * 100)
+            if (request.progressFunc) {
+              request.progressFunc(percent);
+            }
           }
         });