layui select联动

//监听省的变化
        form.on('select(sheng)', function(data){
          // data.value 为选中值
          $.post('{:U("Excel/getshi")}', {shi: data.value}, function(result) {
            result = JSON.parse(result);

            var htmls = "";
            for(var i=0; i<result.data.length; i++){
              htmls += '<option value = "' + result.data[i].area_id + '">' + result.data[i].area_name + '</option>';
            }

            $('#shi').html(htmls);
            form.render('select');

          });

        })