public PartialViewResult BookSummary(Reader reader, Shelf shelf, Book book)
{
//检查用户所选图书是否已在书架上或处于借阅状态
if (orderProcessor.Norepeat(book, reader) && shelf.Norepeat(book))
{
ViewBag.statue = "可借";
}
else
{
ViewBag.statue = "不可借";
}
return(PartialView(book));
}