pub mod msg_const {
    pub const ADD_SUCCESS: &str = "添加成功";
    pub const ADD_FAIL: &str = "添加失败";

    pub const DELETE_SUCCESS: &str = "删除成功";
    pub const DELETE_FAIL: &str = "删除失败";

    pub const UPDATE_SUCCESS: &str = "更新成功";
    pub const UPDATE_FAIL: &str = "更新失败";
}
