How to realize three-level linkage of address page in WeChat applet development

The problem I encountered is

##The data the backend gave me contains the ID corresponding to each address, such as Beijing: 2 Beijing: 50 Dongcheng District: 500

When processing this data, I made some modifications based on the original master’s code,

<code class="hljs bash" style="box-sizing: border-box; outline: 0px; display: block; padding: 0px; font-family: Consolas, Inconsolata, Courier, monospace; line-height: 22px; background-color: rgb(246, 248, 250); border-radius: 4px; overflow-x: auto; word-wrap: normal; word-break: break-all;"><span style="font-size: 14px;"><span class="hljs-built_in" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(79, 79, 79); word-break: break-all;">let</span> val = e.detail.value,
            t = this.data.values,
            cityData = this.data.cityData,
            index = this.data.id,
            list = this.data.addrList;
            list[index].area = <span class="hljs-literal" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(0, 102, 102); word-break: break-all;">true</span>;
            try {                <span class="hljs-keyword" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(0, 0, 136); word-break: break-all;">if</span> (val[0] != t[0]) { //当val是选择省份的时候
                const citys = [];
                const countys = [];
                    cityData[val[0]].child.map(item => citys.push({name:item.name,id:item.id}));
                    cityData[val[0]].child[0].child.map(item => countys.push({name:item.name,id:item.id}));
                    list[index].provinceName = this.data.provinces[val[0]].name;//省份
                    list[index].cityName = cityData[val[0]].child[0].name;//城市
                    list[index].districtName = cityData[val[0]].child[0].child[0].name;//地区
                    list[index].province = this.data.provinces[val[0]].id;//对应的传值ID
                    list[index].city = cityData[val[0]].child[0].id;//对应的传值ID
                    list[index].district = cityData[val[0]].child[0].child[0].id;//对应的传值ID
                this.setData({
                    citys: citys,
                    countys: countys,
                    values: val,
                    value: [val[0], 0, 0],
                    addrList: list
                })                    <span class="hljs-built_in" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(79, 79, 79); word-break: break-all;">return</span>;
                }                <span class="hljs-keyword" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(0, 0, 136); word-break: break-all;">if</span> (val[1] != t[1]) {//当val是选择城市的时候
                    const countys = [];
                    cityData[val[0]].child[val[1]].child.map(item => countys.push({name:item.name,id:item.id}));
                    list[index].cityName = this.data.citys[val[1]].name;// 选择城市
                    list[index].city = this.data.citys[val[1]].id;//对应的传值ID
                    list[index].districtName = cityData[val[0]].child[val[1]].child[0].name;//选择城市对应的地区
                    list[index].district = cityData[val[0]].child[val[1]].child[0].id;//对应的传值ID
                    this.setData({
                        countys: countys,
                        values: val,
                        value: [val[0], val[1], 0],
                        addrList: list
                    })                    <span class="hljs-built_in" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(79, 79, 79); word-break: break-all;">return</span>;
                }                <span class="hljs-keyword" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(0, 0, 136); word-break: break-all;">if</span> (val[2] != t[2]) {//当val是选择地区的时候
                    list[index].districtName = this.data.countys[val[2]].name;//选择地区
                    list[index].district = this.data.countys[val[2]].id;//对应的传值ID
                    this.setData({
                        county: this.data.countys[val[2]].name,
                        values: val,
                        addrList: list
                    })                    <span class="hljs-built_in" style="font-size: 14px; box-sizing: border-box; outline: 0px; color: rgb(79, 79, 79); word-break: break-all;">return</span>;
                }    

            } catch(e) {
                // statements
                console.log(e);
            }
list里面是有 收货人，电话，等等信息  但是我只操作改变数组里面地址改变的信息，</span></code>

layout The areas that need to be modified are

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