/**
 * 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 = 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})(window);

(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));

<!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="/UploadFiles/2021-04-02/areaData.js">

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。