html

                  区域                                    省份                    {$region_province}                                                     地级市                                                                         市、县级市                                                                

 

js

ajax，php代码

function region($parent_id,$region_type){           //region(0,北京市)    $where = "where parent_id = $parent_id";        $sql = mysql_query("select * from rv_region $where");    //echo $where;    while($re = mysql_fetch_row($sql)){        $arr[] = $re;        }    if($region_type =='1'){        $province .= "地级市";    }else if($region_type =='2'){        $province .= "市、县级市";        }        foreach($arr as $k=>$val){        $province .= "".$val[2]."";            }        return $province;}   $parent_id = $_GET['parent_id'];$region_type = $_GET['retion_type'];    echo region($parent_id,$region_type);

三级联动mysql数据