由于项目需要需要实现一个省市联动，由于业务有一些特殊的需求，使用现有的插件略有不便，就自己实现了一个。
首先需要保存地区数据的JS数据文件，我这里命名为areaData.js，内容如下：

/**
 * 保存地区信息
 * 数据格式
 * areaData = [{'pro': '北京', 'cities': {'-1': '北京'}}, {...}]
 * 直辖市存在-1，表示就是直辖市
 */
 (function(window) {
 window.areaData = [{"pro":"u5317u4eac","cities":{"-1":"u5317u4eac","0":"u4e1cu57ceu533a","1":"u897fu57ceu533a","4":"u671du9633u533a","5":"u4e30u53f0u533a","6":"u77f3u666fu5c71u533a","7":"u6d77u6dc0u533a","8":"u95e8u5934u6c9f","9":"u623fu5c71","10":"u901au5dde","11":"u987au4e49","12":"u660cu5e73","13":"u5927u5174","14":"u5e73u8c37","15":"u6000u67d4","16":"u5bc6u4e91","17":"u5ef6u5e86"}},{"pro":"u4e0au6d77","cities":{"-1":"u4e0au6d77","0":"u9ec4u6d66","2":"u5f90u6c47","3":"u957fu5b81","4":"u9759u5b89","5":"u666eu9640","6":"u95f8u5317","7":"u8679u53e3","8":"u6768u6d66","9":"u95f5u884c","10":"u5b9du5c71","11":"u5609u5b9a","12":"u6d66u4e1c","13":"u91d1u5c71","14":"u677eu6c5f","15":"u9752u6d66","17":"u5949u8d24","18":"u5d07u660e"}},{"pro":"u5929u6d25","cities":{"-1":"u5929u6d25","0":"u548cu5e73u533a","1":"u4e1cu4e3du533a","2":"u6cb3u4e1cu533a","3":"u897fu9752u533a","4":"u6cb3u897fu533a","5":"u6d25u5357u533a","6":"u5357u5f00u533a","7":"u5317u8fb0u533a","8":"u6cb3u5317u533a","9":"u6b66u6e05u533a","10":"u7ea2u6865u533a","14":"u5b81u6cb3","15":"u9759u6d77","16":"u5b9du577b","17":"u84dfu53bf","18":"u6ee8u6d77u65b0u533a"}},{"pro":"u91cdu5e86","cities":{"-1":"u91cdu5e86","0":"u4e07u5dde","1":"u6daau9675","2":"u6e1du4e2d","3":"u5927u6e21u53e3","4":"u6c5fu5317","5":"u6c99u576au575d","6":"u4e5du9f99u5761","7":"u5357u5cb8","8":"u5317u789a","9":"u4e07u76db","10":"u53ccu6322","11":"u6e1du5317","12":"u5df4u5357","13":"u9ed4u6c5f","14":"u957fu5bff","15":"u7da6u6c5f","16":"u6f7cu5357","17":"u94dcu6881 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})(window);

插件文件名为：provinceCity.js，源码：

(function($){
 /**
 * 省市联动
 * @param {Array} areaData 地区数组 格式：[{pro: '北京', cities: {-1: 北京, 0: 东城区, ...}},{...}]
 * @param {Object} options 一些配置选项
 * @returns {Object} jQuery对象
 */
 $.fn.citySelect = function(areaData, options){
 if(!$.isArray(areaData)) return;
 var opts = $.extend({
 provinceID: -1,
 cityID: -1,
 isShowDefaultVal: true,
 isDealComArea: false
 }, options);
 var $province = $(this).find('select').eq(0);
 var $city = $(this).find('select').eq(1);
 //-1是直辖市信息
 var provicneID = opts.provinceID;
 var cityID = opts.cityID;
 var isShowDefaultVal = opts.isShowDefaultVal;
 var isDealComArea = opts.isDealComArea;
 var defaultData = ['请选择', '-2'];
 var tmpArr = [];
 
 //增加下拉项到临时数组
 var addOpt = function(val,text,defVal){
 tmpArr.push("<option value='"+val+"' "+(parseInt(defVal,10)==parseInt(val,10)+''?"selected":"")+">"+text+"</option>");
 };
 
 //省份变更联动城市下拉
 var changeHandler = function(){
 var provinceID = $province.val();
 tmpArr = [];
 
 //非省【请选择】情况下，不显示地市【请选择】
 provinceID == -2 && isShowDefaultVal && addOpt(defaultData[1],defaultData[0]);
 if(provinceID != -2) {
 $.each(areaData[provinceID]['cities'], function(cid, city) {
 //是否只显示直辖市
 if(isDealComArea && provinceID < 4) {
 addOpt(cityID, areaData[provinceID]['pro'], cityID);
 return false;
 }else {
 cid != -1 && addOpt(cid, city， cityID);
 }
 });
 }
 $city.html(tmpArr.join(''));
 };
 
 //初始化省份
 var initProvince = function() {
 tmpArr = [];
 //默认省级下拉
 isShowDefaultVal && addOpt(defaultData[1],defaultData[0]);
 $.each(areaData, function(pid,details){
 addOpt(pid,details.pro,provicneID);
 });
 $province.html(tmpArr.join(''));
 };
 
 //初始化事件
 var init = function() {
 initProvince();
 //省级联动 控制
 $province.on('change', changeHandler);
 changeHandler();
 }
 
 init();
 
 return this;
 };
}(jQuery));

可根据需要稍作调整

例子基本结构如下：

<!DOCTYPE html>
<html>
<head>
 <title>省市联动</title>
 <meta charset="utf-8">
</head>
<body>
<div class="area">
 <select name="province"></select>
 <select name="city"></select>
</div>
<script src="http://www.gimoo.net/t/1904/areaData.js"></script>
<script src="http://www.gimoo.net/t/1904/provinceCity.js"></script>
</body>
</html>

使用方法：
第一种：初始化省市选择

$('.area').citySelect(areaData);

效果：

第二种：默认不显示【请选择】

$('.area').citySelect(areaData, {
 isShowDefaultVal: false
 });

效果：

第三种：有初始省市

$('.area').citySelect(areaData, {
 provinceID: 10,
 cityID: 3,
 isShowDefaultVal: false
 });

效果：

第四种：属于业务的特殊需求，当为直辖市的时候，只显示直辖市，不显示分区（这个需求比较特殊）

$('.area').citySelect(areaData, {
 provinceID: 0,
 cityID: -1,
 isDealComArea: true,
 isShowDefaultVal: false
 });

效果：

以上就是基于jquery实现省市联动效果的代码，在这里做一下记录，欢迎大家提建议，共同进步。