public function back($id)
{
$data = array('errNum' => 0, 'errMsg' => '', 'errDate' => '');
$borrow = Borrow::find($id);
$borrow->status = 1;
$book = Book::find($borrow->book_id);
$book->book_res = $book->book_res + 1;
$book->save();
if ($borrow->update()) {
$data['errMsg'] = "归还成功";
return json_encode($data);
} else {
$data['errMsg'] = "归还失败";
return json_encode($data);
}
}
