fix: type cast (#1384)

lib/pages/login/controller.dart

@@ -119,12 +119,12 @@ class LoginPageController extends GetxController
   }
 
   // 申请极验验证码
-  Future<void> getCaptcha(
+  void getCaptcha(
     String geeGt,
     String geeChallenge,
     VoidCallback onSuccess,
-  ) async {
-    void updateCaptchaData(Map<String, dynamic> json) {
+  ) {
+    void updateCaptchaData(Map json) {
       captchaData
         ..validate = json['geetest_validate']
         ..seccode = json['geetest_seccode']
@@ -132,18 +132,19 @@ class LoginPageController extends GetxController
           challenge: json['geetest_challenge'],
           gt: geeGt,
         );
+      SmartDialog.showToast('验证成功');
+      onSuccess();
     }
 
     if (Utils.isDesktop) {
-      final res = await Get.dialog<Map<String, dynamic>>(
+      Get.dialog<Map<String, dynamic>>(
         GeetestWebviewDialog(geeGt, geeChallenge),
-      );
+      ).then((res) {
         if (res != null) {
           updateCaptchaData(res);
-        onSuccess();
-      }
-      return;
         }
+      });
+    } else {
       var registerData = Gt3RegisterData(
         challenge: geeChallenge,
         gt: geeGt,
@@ -158,12 +159,10 @@ class LoginPageController extends GetxController
           },
           onResult: (Map<String, dynamic> message) {
             if (kDebugMode) debugPrint("Captcha result: $message");
-          String code = message["code"];
+            final String code = message["code"];
             if (code == "1") {
               // 发送 message["result"] 中的数据向 B 端的业务服务接口进行查询
-            SmartDialog.showToast('验证成功');
               updateCaptchaData(message['result']);
-            onSuccess();
             } else {
               // 终端用户完成验证失败，自动重试 If the verification fails, it will be automatically retried.
               if (kDebugMode) debugPrint("Captcha result code : $code");
@@ -233,6 +232,7 @@ class LoginPageController extends GetxController
         )
         ..startCaptcha(registerData);
     }
+  }
 
   // cookie登录
   Future<void> loginByCookie() async {