NSDictionary *erroInfo = error.userInfo;
NSData *data = [erroInfo valueForKey:@"com.alamofire.serialization.response.error.data"];
NSString *errorString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
//转成字典接收
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingMutableContainers error:nil];
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