public function actionTest(){  
 if(isset($_POST["number"])){   
 $html = “success”;
 }else{
 $html ="something wrong";
 }
 sleep(5);
 echo $html;
 Yii::app()->end();
}

<!-- 模态框（Modal） -->
<div class="modal fade" id="searchModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
 <div class="modal-dialog">
 <div class="modal-content">    
  <div class="modal-body">
  <div id='modal_message' style="text-align: center"><h2>正在查询中.....</h2></div>
  <div class="progress progress-striped active">
   <div class="progress-bar progress-bar-success" role="progressbar" aria-valuenow="60" 
   aria-valuemin="0" aria-valuemax="100" style="width: 100%;">
   <span class="sr-only">100% 完成</span>
   </div>
  </div>
  </div>
 </div><!-- /.modal-content -->
 </div><!-- /.modal -->
</div>
<script type="text/javascript">
 $("#searchModal").modal("show");//显示“正在查询”字样的模态框
 htmlobj = $.ajax({ 
 url:"/Controller/test", 
 type : 'POST', 
 data : { "number" : "123",    
  }, 
 dataType : "text", 
 //contentType : 'application/x-www-form-urlencoded', 
 async : true, 
 success : function(mydata) { 
  $('#searchModal').modal('hide');//服务器停止了5秒,sleep(5)，假设是查询数据用了5秒
  //setTimeout("$('#searchModal').modal('hide')",2000); //设置2000毫秒之后模态框消失   
  $('#searchModal').on('hidden.bs.modal', function () {
 //    // 执行一些动作...
   $("#homeworkContent").html(mydata); //显示后端传递的结果
   });
 }, 
 error : function() { 
  alert("calc failed"); 
 } 
}); 
</script>