如果没有头像，请从json检查性别并放入img标签

I build a app (its my first app) and there i give user the option to upload there user avatar and setup there genders. if (in this case a girl) dont upload any avatar, then i want to check the json and get the gender information, with this gender information i want to place the url to the female default avatar.I build a app (its my first app) and there i gi