js省市区下拉代码分享

<select name="province" id="province" onchange="getCity()">
    <option value="0">所在省</option>
    <option value="直辖市">直辖市</option>
    <option value="广东省">广东省</option>
    <option value="江苏省">江苏省</option>
    <option value="福建省">福建省</option>
</select>
<select name="city" id="city" onchange="getDistrict()">
    <option value="0">所在市</option>
</select>
<select class="clear-Mar" name="district" id="district">
    <option value="0">所在区</option>
</select>
<script>
    var city = [["北京市", "天津市", "上海市", "重庆市"], ["广州市", "深圳市", "珠海市", "东莞市"], ["南京市", "苏州市", "南通市", "常州市"], ["福州市", "厦门市", "莆田市", "泉州市"]];
    var district = [[["东城区", "西城区", "宣武区"], ["和平区", "红桥区", "塘沽区"], ["杨浦区", "徐汇区"], ["万州区", "涪陵区"]], [["天河区", "海珠区", "白云区", "番禺区"], ["南山区", "宝安区", "福田区"], ["香洲区", "斗门区", "金湾区"], ["东城区", "莞城区", "万江区"]], [['玄武区', '白下区', '秦淮区', '建邺区'], ['沧浪区', '平江区', '金阊区', '虎丘区'], ['崇川区', '港闸区', '海安县', '如东县'], ['天宁区', '钟楼区', '新北区']], [['鼓楼区', '台江区', '仓山区', '马尾区'], ['思明区', '海沧区', '湖里区', '集美区'], ['城厢区', '涵江区', '荔城区', '秀屿区'], ['鲤城区', '丰泽区', '洛江区', '泉港区']]];
    function getCity() {
        //获得省份下拉框的对象
        //    var sltProvince=document.forms[0].province;
        var sltProvince = document.getElementById("province");
        //获得城市下拉框的对象
        //var sltCity=document.forms[0].city;     

        var sltCity = document.getElementById("city");

        //获得市区下拉框的对象
        // var sltDistrict=document.forms[0].district;

        var sltDistrict = document.getElementById("district");
        //得到对应省份的城市数组
        var provinceCity = city[sltProvince.selectedIndex - 1];
        //清空城市下拉框，仅留提示选项
        sltCity.length = 1;
        sltDistrict.length = 1;
        //将城市数组中的值填充到城市下拉框中
        for (var i = 0; i < provinceCity.length; i++) {
            sltCity[i + 1] = new Option(provinceCity[i],provinceCity[i]);
        }
    }
    function getDistrict() {
        var sltProvince = document.getElementById("province");
        //获得城市下拉框的对象
        var sltCity = document.getElementById("city");
        //获得市区下拉框的对象
        var sltDistrict = document.getElementById("district");
        //得到对应城市的市区数组
        var cityDistrict = district[sltProvince.selectedIndex - 1][sltCity.selectedIndex - 1];
        //清空城市下拉框，仅留提示选项
        sltDistrict.length = 1;
        //将市区数组中的值填充到市区下拉框中
        for (var i = 0; i < cityDistrict.length; i++) {
            sltDistrict[i + 1] = new Option(cityDistrict[i],cityDistrict[i]);
        }
    }
</script>