上传头像
Future getImage() async {
    var image = await ImagePicker.pickImage(source: ImageSource.gallery);
    ItemDao.UpLoad(image).then((res){
      if(res['resultCode'] == 'ok'){
        setState(() {
          url = res['fileId'];
        });
      }else{
        Fluttertoast.showToast(
              msg: res['codeDesc'],
              backgroundColor:
                  Color(GSYColors.toastBg),
              textColor:
                  Color(GSYColors.titleBlack));
          return;
      }
    }).catchError((e){
      print(e.toString());
    });
    setState(() {
      if (image != null) _image = image;
    });
  }