代码有点问题,不知道怎么改,点城市获取不到区县

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .box{
            width: 450px;
            padding: 5px;
            border: 2px solid #eeeeee;
        }
        .xx{
            border-bottom: 2px solid #56b4f8;
            list-style: none;
            width: 450px;
            height: 40px;
            box-sizing: border-box;
        }
        .xx li{
            width: 80px;
            float: left;
            height: 40px;
            line-height: 40px;
            text-align: center;
        }
        .active{
            background-color:  #56b4f8;
            color: #f5f5f5;
        }
        span{
            width: 80px;
            height: 30px;
            display: inline-block;
            font-size: 12px;
            text-align: center;
            line-height: 15px;
            margin: 5px;
            /* float: left; */
        }
        span:hover{
            background-color:  #56b4f8;
            color: #f5f5f5;
        }
        #country{
            width: 450px;
            /* height: 300px; */
            background-color: pink;
        }
        #countryside{
            width: 450px;
            /* height: 300px; */
            background-color: yellow;
        }
        .sure{
            background-color:  #56b4f8;
            color: #f5f5f5;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul class="xx">
            <li class="l1 active">省份</li>
            <li class="l1">城市</li>
            <li class="l1">区县</li>
        </ul>
        <div class="show">
            <div id="city"></div>
            <div id="country"></div>
            <div id="countryside"></div>
        </div>
    </div>
    <script src="./area-json.js"></script>
    <script>
        var li = document.querySelectorAll(".xx li")
        var div = document.querySelectorAll(".show div")
        var box = document.querySelector(".box")       
        var show = document.querySelector(".show")
        var city = document.getElementById("city");
        var country = document.getElementById("country");
        var countryside = document.getElementById("countryside");
        var countryarr = [];
        var countrysidearr = [];
        add(city,data)
        for(var i = 0;i<data.length;i++){
            city.children[i].onclick = function(){
                country.innerText= ""
                for(var j = 0;j<data.length;j++){
                    if(data[j].code == this.className){
                        countryarr = data[j].children        
                    }
                }

                for(var d = 0;d<li.length;d++){
                    li[d].className = "li"
                }
                li[1].className = "l1 active"
                div[1].style.display = "block"
                div[0].style.display = "none"
                div[2].style.display = "none"

                add(country,countryarr)
            }
        }
        for(var k = 0;k<countryarr.length;k++){
            country.children[k].onclick = function(){
                countryside.innerHTML = ""
                for(var l = 0;l<data.length;l++){
                    if(data[l].code == this.className){
                        countrysidearr = countryarr[j].children        
                    }
                }
                add(countryside,countrysidearr)
            }
        }
        li[0].onclick = function(){
            for(var b = 0;b<li.length;b++){
                li[b].className = "li"
            }
            li[0].className = "l1 active"
            div[0].style.display = "block"
            div[1].style.display = "none"
            div[2].style.display = "none"
        }
        li[1].onclick = function(){
            for(var b = 0;b<li.length;b++){
                li[b].className = "li"
            }
            li[1].className = "l1 active"
            div[1].style.display = "block"
            div[0].style.display = "none"
            div[2].style.display = "none"
        }
        li[2].onclick = function(){
            for(var b = 0;b<li.length;b++){
                li[b].className = "li"
            }
            li[2].className = "l1 active"
            div[2].style.display = "block"
            div[0].style.display = "none"
            div[1].style.display = "none"
        }        
        function add (dom,arr){
            for(var i = 0;i<arr.length;i++){
                var span = document.createElement("span");
                span.innerHTML = arr[i].name;
                span.className = arr[i].code;
                dom.appendChild(span);
            }
        }
    </script>
</body>
</html>

js文件下载地址:https://download.csdn.net/download/weixin_46073353/16759489?spm=1001.2014.3001.5503

countrysidearr的值置空了

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .box{
            width: 450px;
            padding: 5px;
            border: 2px solid #eeeeee;
        }
        .xx{
            border-bottom: 2px solid #56b4f8;
            list-style: none;
            width: 450px;
            height: 40px;
            box-sizing: border-box;
        }
        .xx li{
            width: 80px;
            float: left;
            height: 40px;
            line-height: 40px;
            text-align: center;
        }
        .active{
            background-color:  #56b4f8;
            color: #f5f5f5;
        }
        span{
            width: 80px;
            height: 30px;
            display: inline-block;
            font-size: 12px;
            text-align: center;
            line-height: 15px;
            margin: 5px;
            /* float: left; */
        }
        span:hover{
            background-color:  #56b4f8;
            color: #f5f5f5;
        }
        #country{
            width: 450px;
            /* height: 300px; */
            background-color: pink;
        }
        #countryside{
            width: 450px;
            /* height: 300px; */
            background-color: yellow;
        }
        .sure{
            background-color:  #56b4f8;
            color: #f5f5f5;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul class="xx">
            <li class="l1 active">省份</li>
            <li class="l1">城市</li>
            <li class="l1">区县</li>
        </ul>
        <div class="show">
            <div id="city"></div>
            <div id="country"></div>
            <div id="countryside"></div>
        </div>
    </div>
    <script src="./area.json"></script>//这里是我这边的数据改成你的
    <script>
        var li = document.querySelectorAll(".xx li")
        var div = document.querySelectorAll(".show div")
        var box = document.querySelector(".box")       
        var show = document.querySelector(".show")
        var city = document.getElementById("city");
        var country = document.getElementById("country");
        var countryside = document.getElementById("countryside");
        var countryarr = [];
        var countrysidearr = [];
        var data = data.data;//这里是我这边的数据,改成你的
        console.log('这是什么?',data)
        add(city,data)
        for(var i = 0;i<data.length;i++){
            city.children[i].onclick = function(){
                country.innerText= ""
                for(var j = 0;j<data.length;j++){
                    if(data[j].code == this.className){
                        countryarr = data[j].children        
                    }
                }
                for(var d = 0;d<li.length;d++){
                    li[d].className = "li"
                }
                li[1].className = "l1 active"
                div[1].style.display = "block"
                div[0].style.display = "none"
                div[2].style.display = "none"
                add(country,countryarr)
                for(var k = 0;k<countryarr.length;k++){
                    console.log('进来了吗',countryarr.length)
                    country.children[k].onclick = function(){
                        countryside.innerHTML = ""
                        for(var n=0;n<countryarr.length;n++){
                            // console.log('ddd',countryarr[n])
                            if(countryarr[n].code == this.className){
                                countrysidearr = countryarr[n].children
                                console.log('区县',countrysidearr)        
                            }
                        } 
                        for(var d = 0;d<li.length;d++){
                            li[d].className = "li"
                        }
                        li[2].className = "l1 active"
                        div[1].style.display = "none"
                        div[0].style.display = "none"
                        div[2].style.display = "block" 
                        add(countryside,countrysidearr)
                    }
                }
            }
        }
        
        li[0].onclick = function(){
            for(var b = 0;b<li.length;b++){
                li[b].className = "li"
            }
            li[0].className = "l1 active"
            div[0].style.display = "block"
            div[1].style.display = "none"
            div[2].style.display = "none"
        }
        li[1].onclick = function(){
            for(var b = 0;b<li.length;b++){
                li[b].className = "li"
            }
            li[1].className = "l1 active"
            div[1].style.display = "block"
            div[0].style.display = "none"
            div[2].style.display = "none"
        }
        li[2].onclick = function(){
            for(var b = 0;b<li.length;b++){
                li[b].className = "li"
            }
            li[2].className = "l1 active"
            div[2].style.display = "block"
            div[0].style.display = "none"
            div[1].style.display = "none"
        }        
        function add (dom,arr){
            for(var i = 0;i<arr.length;i++){
                var span = document.createElement("span");
                span.innerHTML = arr[i].name;
                span.className = arr[i].code;
                dom.appendChild(span);
            }
        }
    </script>
</body>
</html>