Jquery AJAX选择省份,市区

前端部分:

<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, minimal-ui">
	<title>AJAX获取省份</title>
	<script src="jquery.js"></script>
	<style>
       *{
       	padding:0;
       	margin:0;
       }
       #select,#select2{
       	width: 100px;
       	height: 20px;
       }
       .option{
       	width: 100px;
       }
	</style>
</head>
<body>
	<select name="" id="select"></select>   
	<select name="" id="select2"></select>
	<script>
       $(function(){
       	var value, htm="",htm2="";
    //初始化
       	console.log(1);
       	$.ajax({
       		url:"info.php",
       		data:"",
       		success:function(data){
       			data=JSON.parse(data);              //把string转换成json格式
       			$.each(data,function(i,j){          //遍历json数据
       				htm +='<option value='+i+'>'+i+'</option>';
       			})
       		    $("#select").html(htm);
       		    value=$("#select").val();           //取得省份的值
       		    for(var i=0;i<data[value].length;i++){
       		    	htm2 +='<option value='+data[value][i]+'>'+data[value][i]+'</option>';
       		    }
       		     $("#select2").html(htm2);
       		}
       	})  	       	      		
    //选择省份和市区
	    $("#select").change(function(){
		    	var num=$(this).val();
		    	htm2="";
	 	       	$.ajax({
	 	       		url:"info.php",
	 	       		data:"",
	 	       		success:function(data){
	 	       			data=JSON.parse(data);
		       		    for(var i=0;i<data[num].length;i++){
		       		    	htm2 +='<option value='+data[num][i]+'>'+data[num][i]+'</option>';
		       		    }
		       		    $("#select2").html(htm2);
	 	       		}
	 	       	})			    	
		});	
	});



	</script>
</body>
</html>

PHP后台部分

<?php
$value='{"北京":["东城区","西城区","崇文区","宣武区","朝阳区","海淀区","丰台区","石景山区","房山区","通州区","顺义区","昌平区","大兴区","怀柔区","平谷区","门头沟区","密云县","延庆县"],
"天津":["和平区","河东区","河西区","南开区","河北区","红桥区","东丽区","西青区","北辰区","津南区","武清区","宝坻区","滨海新区","静海县","宁河县","蓟县"],
"上海":["黄浦区","卢湾区","徐汇区","长宁区","静安区","普陀区","闸北区","虹口区","杨浦区","闵行区","宝山区","嘉定区","浦东新区","金山区","松江区","青浦区","奉贤区","崇明县"],
"重庆":["渝中区","大渡口区","江北区","南岸区","北碚区","渝北区","巴南区","长寿区","双桥区","沙坪坝区","万盛区","万州区","涪陵区","黔江区","永川区","合川区","江津区","九龙坡区","南川区","綦江县","潼南县","荣昌县","璧山县","大足县","铜梁县","梁平县","开县","忠县","城口县","垫江县","武隆县","丰都县","奉节县","云阳县","巫溪县","巫山县","石柱土家族自治县","秀山土家族苗族自治县","酉阳土家族苗族自治县","彭水苗族土家族自治县"],
"河北":["石家庄","唐山","秦皇岛","邯郸","邢台","保定","张家口","承德","沧州","廊坊","衡水"],
"山西":["太原","大同","阳泉","长治","晋城","朔州","晋中","运城","忻州","临汾","吕梁"],
"辽宁":["沈阳","大连","鞍山","抚顺","本溪","丹东","锦州","营口","阜新","辽阳","盘锦","铁岭","朝阳","葫芦岛"],
"吉林":["长春","吉林","四平","辽源","通化","白山","松原","白城","延边朝鲜族自治州"],
"黑龙江":["哈尔滨","齐齐哈尔","鹤岗","双鸭山","鸡西","大庆","伊春","牡丹江","佳木斯","七台河","黑河","绥化","大兴安岭"],
"江苏":["南京","苏州","无锡","常州","镇江","南通","泰州","扬州","盐城","连云港","徐州","淮安","宿迁"],
"浙江":["杭州","宁波","温州","嘉兴","湖州","绍兴","金华","衢州","舟山","台州","丽水"],
"安徽":["合肥","芜湖","蚌埠","淮南","马鞍山","淮北","铜陵","安庆","黄山","滁州","阜阳","宿州","巢湖","六安","亳州","池州","宣城"],
"福建":["福州","厦门","莆田","三明","泉州","漳州","南平","龙岩","宁德"],
"江西":["南昌","景德镇","萍乡","九江","新余","鹰潭","赣州","吉安","宜春","抚州","上饶"],
"山东":["济南","青岛","淄博","枣庄","东营","烟台","潍坊","济宁","泰安","威海","日照","莱芜","临沂","德州","聊城","滨州","菏泽"],
"河南":["郑州","开封","洛阳","平顶山","安阳","鹤壁","新乡","焦作","濮阳","许昌","漯河","三门峡","南阳","商丘","信阳","周口","驻马店"],
"湖北":["武汉","黄石","十堰","荆州","宜昌","襄樊","鄂州","荆门","孝感","黄冈","咸宁","随州","恩施"],
"湖南":["长沙","株洲","湘潭","衡阳","邵阳","岳阳","常德","张家界","益阳","郴州","永州","怀化","娄底","湘西"],
"广东":["广州","深圳","珠海","汕头","韶关","佛山","江门","湛江","茂名","肇庆","惠州","梅州","汕尾","河源","阳江","清远","东莞","中山","潮州","揭阳","云浮"],
"海南":["海口","三亚"],
"四川":["成都","自贡","攀枝花","泸州","德阳","绵阳","广元","遂宁","内江","乐山","南充","眉山","宜宾","广安","达州","雅安","巴中","资阳","阿坝","甘孜","凉山"],
"贵州":["贵阳","六盘水","遵义","安顺","铜仁","毕节","黔西南","黔东南","黔南"],
"云南":["昆明","曲靖","玉溪","保山","昭通","丽江","普洱","临沧","德宏","怒江","迪庆","大理","楚雄","红河","文山","西双版纳"],
"陕西":["西安","铜川","宝鸡","咸阳","渭南","延安","汉中","榆林","安康","商洛"],
"甘肃":["兰州","嘉峪关","金昌","白银","天水","武威","酒泉","张掖","庆阳","平凉","定西","陇南","临夏","甘南"],
"青海":["西宁","海东","海北","海南","黄南","果洛","玉树","海西"],
"内蒙古":["呼和浩特","包头","乌海","赤峰","通辽","鄂尔多斯","呼伦贝尔","巴彦淖尔","乌兰察布","锡林郭勒盟","兴安盟","阿拉善盟"],
"广西":["南宁","柳州","桂林","梧州","北海","防城港","钦州","贵港","玉林","百色","贺州","河池","来宾","崇左"],
"西藏":["拉萨","那曲","昌都","林芝","山南","日喀则","阿里"],
"宁夏":["银川","石嘴山","吴忠","固原","中卫"],
"新疆维吾尔自治区":["乌鲁木齐","克拉玛依","吐鲁番","哈密","和田","阿克苏","喀什","克孜勒苏","巴音郭楞","昌吉","博尔塔拉","伊犁","塔城","阿勒泰"],
"香港":["香港岛","九龙东","九龙西","新界东","新界西"],
"澳门":["澳门半岛","离岛"],
"台湾":["台北","高雄","基隆","新竹","台中","嘉义","台南市"]}';
echo $value;
?>