AJAX，PHP，CodeIgniter - 无法从行动中获取价值？

I have an action.

<div class="options">
   <div class="grid-list">
      <a id="grid" class="grid curent" href="javascript:void(0)" title="Grid"><span>img</span></a>
      <a id="list" class="list" href="javascript:void(0)" title="List"><span>img</span></a>
    </div><!-- .grid-list -->
</div><!-- .options -->

When I click a tag, only beforeSend (ajax) works.

You can use the following code in your PHP function

$view_type=$_POST['viewType'];

first in url use your base_url in ajax request, define base_url in you config. in controller use $view_type = $this->input->post('viewType')