laravel5.4中ajax删除数据

1 JS代码

function deleteInfo(id)
{
    if(id) {
        var r=confirm('确定要删除吗');
        if(r==true) {
            $.ajax({ 
                url: "{{ URL('admin/announcements/delete/') }}", 
                type: "POST",
                data:{id:id,_token:'{{csrf_token()}}'},
                success: function(data){
                    if(data==1) {
                        alert('删除成功');
                        location.href= "{{ URL('admin/announcements/')}}";
                    } else {
                        alert('删除失败');
                    }
             }});
        }
    }
}
</script>

2  路由规则

$router->post('announcements/delete', 'AnnouncementsController@delete');

3  控制器代码

 public function delete(Request $request)
    {
        $res=0;
        $id=$request->input('id');
        
        $announcement = Announcement::find($id);
        $result=$announcement->delete();
     
        $result==true && $res=1;
        
        return  $res;
    }