为什么总是未定义变量？我已经很紧凑了

Question

  

ErrorException与消息“未定义的变量：类别”一起引发   （视图：   C：\ xampp \ htdocs \ MimiShop \ resources \ views \ managecategory.blade.php）“

---

视图

@foreach($categories as $category)
    <tr scope="row" id="categoryName">
        <td><option value="{{$category->categoryid}}">{{$category->name}}/option></td>
        <td><a href="/updatecategory/{{$category->categoryid}}"> <button>Edit</button></a></td>
        <td><button>Delete</button></td>
    </tr>
@endforeach

---

控制器

public function index()
{
    $categories=category::all();
    return view('managecategory', compact('categories'));
}