1、优化图片加载ImageWidget

lib/widget/image_widget.dart

@@ -22,11 +22,10 @@ class ImageWidget {
     if (url != null && !url.startsWith("http")) {
       url = domainUrl + url;
     }
-
+    url = url != null && url.isNotEmpty ? "$url?${Random().nextDouble()}" : "";
     return OctoImage(
       // 拼接Random，修复图片地址固定，无法展示最新图片问题
-      image:
-          CachedNetworkImageProvider("${url ?? ""}?${Random().nextDouble()}"),
+      image: CachedNetworkImageProvider(url),
       imageBuilder: MyOctoImageTransformer.getOctoImageBuilder(type),
       errorBuilder: ImageWidget.placeholderBuilder(errorWidget: placeholder),
       fit: fit,