Easyui numberbox获取焦点事件

 <input  id="auctionBrandNoGetByHand"  style="160px;"
                        class="easyui-numberbox"  data-options="required:true,validType:'number',validType:'length[1,5]',min:0,precision:0" ></input><br/>

//聚焦输入框           
 $('#auctionBrandNoGetByHand').numberbox().next('span').find('input').focus();