first commit

untitled/lib/service/DownloadService.dart

@@ -0,0 +1,14 @@
+import 'package:dio/dio.dart';
+import 'package:peach/http/Dio.dart';
+
+class DownloadService {
+
+  /// 下载图片
+  static Future downImage({ String url, Map<String, dynamic> params}) async {
+    return await HttpApi().get(
+      url: url,
+      params: params,
+      options: Options(responseType: ResponseType.bytes)
+    );
+  }
+}