使用laravel和ajax实现整个页面无刷新的操作方法

CREATE TABLE IF NOT EXISTS mr_key
(
id int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT COMMENT '键id',
project_id int(11) NOT NULL COMMENT '外键项目id',
name varchar(100) NOT NULL COMMENT '键名',
structure enum('string', 'hash', 'list', 'set', 'zset') COMMENT '数据结构',
ttl varchar(50) NOT NULL COMMENT '过期时间',
user varchar(20) NOT NULL COMMENT '使用者',
reason varchar(255) NOT NULL COMMENT '使用原因',
created_time int(11) NOT NULL COMMENT '创建时间',
isDelete int(2) NOT NULL DEFAULT '0' COMMENT '是否删除（0=不删除，1=删除）'
)ENGINE=innodb DEFAULT CHARSET=utf8 COMMENT='键表';

@include('layout.nav')
 @include('layout.slide')
 
 <div class="contain" style="width: 84%;" id="contain">
  <div style="width:30%;margin-bottom:20px;">
   <select class="form-control" id="project">
    <option value="0" >请选择城市</option>
    @foreach ($projects as $project)
     <option value="{{ $project->id }}" @if("{{ $project->id }}" == "{{ $project_id }}")selected="selected"@endif >{{ $project->name }}</option>
    @endforeach
   </select>
  </div>
  <table class="table table-hover">
   <thead>
   <tr>
    <th>id</th>
    <th>键名</th>
    <th>数据结构</th>
    <th>过期时间</th>
    <th>使用者</th>
    <th>使用原因</th>
    <th>操作</th>
   </tr>
   </thead>
   <tbody>
   @foreach ($keys as $key)
    <tr>
     <td>{{ $key->id }}</td>
     <td>{{ $key->name }}</td>
     <td>{{ $key->structure }}</td>
     <td>{{ date("Y-m-d H:i:s", ($key->ttl + $key->created_time)) }}</td>
     <td>{{ $key->user }}</td>
     <td>{{ $key->reason }}</td>
     <td>修改 删除</td>
    </tr>
   @endforeach
   </tbody>
   <div style="position:absolute;:450px;right:120px;">
    {{ $keys->render() }}
    <div style="float:right;letter-spacing: 2px;margin-left:10px;" class="pagi__count"> 共<b>{{ $count }}</b>条数据</div>
   </div>
 
  </table>
 </div>

 <script type="text/javascript">
  $('#project').change(function() {
   $.post("{{ url('key/klist') }}/"+$('#project').val(),  // 路由为Route::any('/key/klist/{project_id}')
    {'_token': '{{ csrf_token() }}'}, function(data) {
    $('#body').html(data);
    });
  });
 </script>

public function klist($project_id)
  {
   if($project_id == 0) {
    $projects = Project::all();
    $keys = Key::orderBy('created_time', 'desc')->paginate(8);
    $count = Key::count();
    $project_id = 0;
    return view('key.index', pact('project_id', 'projects','keys', 'count'));
   }
   $projects = Project::all();
   $keys = Project::find($project_id)->key()->paginate(8);
   $count = Project::find($project_id)->key->count();
   return view('key.index', pact('project_id' ,'projects', 'keys', 'count'));
  }