layui ajax动态加载渲染select下拉框

<div class="layui-inline">
            <div class="layui-input-inline">
              <select name="label" id="catalog">
                <option value="">专业分类</option>
              </select>
            </div>
          </div>

function getCatalogList(){
          admin.req({
              url: layui.setter.api +'m-catalog-list'
              ,type: 'get'
              ,data: {
              }
              ,done: function(result){
                  $.each(result.data, function(index, item) {
                      $('#catalog')
                          .append(new Option(item.name, item.id));
                  });
                  layui.form.render("select");

              }

          });

      }