public function deletecate(Request $request)
{
if ($request->method() == "POST") {
// $catids=implode(",",$request->input("catids"));
$res = Category::whereIn('id', $request->input("catids"))->delete();
if ($res > 0) {
return redirect()->back()->withErrors('共删除' . $res . '条记录。');
}
}
}