Easyui多个下拉框联动效果

<table style="padding:10px 20px 10px 40px;">
            <tr>
                <td>省级:</td>
                <td>
                    <input id="province" name="province" class="easyui-combobox"/>
                </td>
                <td>市级:</td>
                <td>
                    <input id="city" class="easyui-combobox"/>
                </td>
                <td>区级:</td>
                <td>
                    <input id="county" class="easyui-combobox"/>
                </td>
               </tr>
          </table> 

$(‘#province‘).combobox({
         valueField:‘code‘,
          textField:‘name‘,
          url:‘../../area/getOne.do‘,
          method:‘get‘,
          onSelect:function(rec){
           var url1=‘../../area/getTwo.do?pid=‘+rec.code+‘&tag=‘+(new Date().getTime());
           $(‘#city‘).combobox(‘reload‘,url1);
         },
         onLoadSuccess: function () {  //加载完成后,设置选中第一项
             var val = $(this).combobox(‘getData‘);
             for(var item in val[0]) {
                  $(this).combobox(‘select‘, val[0][item]);
             }
         }
    });
$(‘#city‘).combobox({
        valueField:‘code‘,
         textField:‘name‘,
         method:‘get‘,
         onSelect:function(rec){
          var url1=‘../../area/getThree.do?pid=‘+rec.code+‘&tag=‘+(new Date().getTime());
          $(‘#county‘).combobox(‘reload‘,url1);
         },
        onLoadSuccess: function () {  //加载完成后,设置选中第一项
          var val = $(this).combobox(‘getData‘);
          for(var item in val[0]) {
              $(this).combobox(‘select‘, val[0][item]);
          }
        }
    });
    $(‘#county‘).combobox({
         valueField:‘code‘,
          textField:‘name‘,
          onLoadSuccess: function () {  //加载完成后,设置选中第一项
           var val = $(this).combobox(‘getData‘);
           for(var item in val[0]) {
                $(this).combobox(‘select‘, val[0][item]);
           }
         }
    });