n changeareaIdArea(i, max_i) {
                //清除后面节点
                for (var x = i + 1; x <= 6; x++) {  //最多6层，足够了
                    $("select[name='areaId_" + x + "']").remove();
                }
                var val = $("select[name='areaId_" + i + "']").val();
                if (val != "") {
                    //取子节点数据，然后显示下一级
                    coreHelper.Post("Api/Tools/GetAreaChildren", { id: val }, function (e) {
                     