地图下钻，双击返回上一级

介绍：
看了好多地图下钻的案例，要么json文件不全胡，要么返回功能不全胡，有的返回是直接写死，返回到首页，我这个小案例是使用地理小工具的数据，本案例可以逐步一级一级的返回，地图的其他样式可以根据项目需求在option中配置。

lodash4.17.21版本：

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<html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><style>#chart-panel {position: absolute;left: 0;right: 0;top: 0;bottom: 0;}</style><script src="https://cdn.bootcdn.net/ajax/libs/echarts/4.2.1/echarts.min.js"></script><!-- <script src="https://lib.baomitu.com/echarts/4.1.0/echarts.min.js"></script> --><script src=""></script><script src="./静态资源/Lodash4.17.21.min.js"></script><script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script><!-- <script src="https://cdn.bootcdn.net/ajax/libs/echarts/5.4.1/echarts.min.js"></script><script src="https://cdn.bootcdn.net/ajax/libs/echarts/4.2.1/echarts.min.js"></script> -->
</head><body><div id="chart-panel" style="margin-top:30px"></div><!-- 为ECharts准备一个具备大小（宽高）的Dom --><script type="text/javascript">//各省份的数据var allData = [{name: '北京'}, {name: '天津'}, {name: '上海'}, {name: '重庆'}, {name: '河北'}, {name: '河南'}, {name: '云南'}, {name: '辽宁'}, {name: '黑龙江'}, {name: '湖南'}, {name: '安徽'}, {name: '山东'}, {name: '新疆'}, {name: '江苏'}, {name: '浙江'}, {name: '江西'}, {name: '湖北'}, {name: '广西'}, {name: '甘肃'}, {name: '山西'}, {name: '内蒙古'}, {name: '陕西'}, {name: '吉林'}, {name: '福建'}, {name: '贵州'}, {name: '广东'}, {name: '青海'}, {name: '西藏'}, {name: '四川'}, {name: '宁夏'}, {name: '海南'}, {name: '台湾'}, {name: '香港'}, {name: '澳门'}];// 基于准备好的dom，初始化echarts实例var myChart = echarts.init(document.getElementById('chart-panel'));for (var i = 0; i < allData.length; i++) {allData[i].value = Math.round(Math.random() * 100);}var allmapdata = [];//每点击一次，都将获取的地图level、name和mapcode储存在数组中var bigArray = [];//保存所有点击过的区域显示的地图，不重复的数组var timeFn = null;var click_history_path_Arry = [];//点击的历史记录click_history_path_Arry.push({//初始历史记录type: 'FeatureCollection',level: 'country',name: '中国',adcode: 'https://geo.datav.aliyun.com/areas_v3/bound/geojson?code=100000_full'})localStorage.setItem('click_history_path_Arry', JSON.stringify(click_history_path_Arry))console.log('初始历史记录：', click_history_path_Arry);loadMap('https://geo.datav.aliyun.com/areas_v3/bound/geojson?code=100000_full', '中国');  //初始化地图/**获取对应的json地图数据，然后向echarts注册该区域的地图，最后加载地图信息@params {String} mapCode:json数据的地址@params {String} name: 地图名称*/function loadMap(mapCode, name) {$.get(mapCode, function (data) {console.log('传入省份json网址的数据：', data.features);var detail_data = []// 从中国地图数据中获取每个省份的名字// console.log("获取点击后的下一级数据：");// console.log("子节点数量：", data.features.length);data.features.forEach(item => {// console.log( item.type, item.properties.level, item.properties.name, item.properties.adcode);if (item.properties.level == 'province') {detail_data.push({type: item.type,level: item.properties.level,name: item.properties.name,adcode: 'https://geo.datav.aliyun.com/areas_v3/bound/geojson?code=' + item.properties.adcode + '_full'})}else if (item.properties.level == 'city') {detail_data.push({type: item.type,level: item.properties.level,name: item.properties.name,adcode: 'https://geo.datav.aliyun.com/areas_v3/bound/geojson?code=' + item.properties.adcode + '_full'})}else if (item.properties.level == 'district') {detail_data.push({type: item.type,level: item.properties.level,name: item.properties.name,adcode: 'https://geo.datav.aliyun.com/areas_v3/bound/geojson?code=' + item.properties.adcode})}});allmapdata.push(...detail_data)//将点击后显示的区域都追加到allmapdata数组bigArray = _.uniqWith(allmapdata, _.isEqual);//利用loadsh进行数组去重// 将 bigArray 转换为字符串，并保存到 localStorage  localStorage.setItem('bigArray', JSON.stringify(bigArray));//console.log('全量不重复数据：', bigArray);//这个数组数据很有用if (data) {echarts.registerMap(name, data);var option = {tooltip: {show: true,textStyle: {color: '#681752',//文字的颜色。fontStyle: 'normal',//文字字体的风格。fontWeight: 'bolder',fontSize: 20,textBorderWidth: 4,textBorderType: 'solid',},formatter: function (params) {if (params.data) return params.name + '：' + params.data['value']},},// 视觉映射组件，用于视觉编码，如颜色、大小等  visualMap: {type: 'continuous',//连续型数据 text: ['', ''],// 文本，默认为数值文本，为空时则不显示  showLabel: false,//false    true// 是否显示文字标签 left: '50',// 组件离容器左侧的距离 min: 0,// 映射的最小值 max: 100,// 映射的最大值  inRange: {// 在视觉映射范围内的视觉元素  color: ['#edfbfb', '#b7d6f3', '#40a9ed', '#3598c1', '#215096',]},splitNumber: 0,// 这里设置为0可能会按照数据自动计算分割段数 },//roam: true, // 是否开启鼠标缩放和平移漫游 series: [{name: 'MAP',type: 'map',mapType: name, // 使用的地图类型，这里使用了变量 name 来动态指定selectedMode: 'false',//是否允许选中多个区域layoutCenter: ["50%", "50%"], //地图位置layoutSize: "100%",zoom: 1, //当前视角的缩放比例label: {normal: {show: true,// 正常状态下是否显示标签 },emphasis: {show: true,// 高亮状态下是否显示标签}},data: allData,// 数据内容，这里使用了变量 allData 来动态指定 }]};myChart.setOption(option);}else {alert('json数据不存在，无法加载该地图');}});}// 查询函数，通过name属性，查找adcodefunction findAdcodeByName(name, data) {for (let i = 0; i < data.length; i++) {if (data[i].name === name) {return data[i].adcode;}}return null; // 如果没有找到，返回null或你想要的任何默认值  }//单击切换到省级地图，当mapCode有值,说明可以切换到下级地图myChart.on('click', function (params) {clearTimeout(timeFn);//由于单击事件和双击事件冲突，故单击的响应事件延迟250毫秒执行// console.log(params);timeFn = setTimeout(function () {var name = params.name; //获取单击时区域的名字const mapCode = findAdcodeByName(name, JSON.parse(localStorage.getItem('bigArray')));//通过name在全量数据中查找mapcode路径localStorage.setItem('danji_name', name)//将单击时的区域名字存储本地localStorage.setItem('danji_mapcode', mapCode)//将单击时的区域json数据存储本地var get_name = localStorage.getItem('danji_name')var get_mapcode = localStorage.getItem('danji_mapcode')console.log("单击区域名字:", get_name, "单击区域mapcode:", get_mapcode);// 当点击的时候将点击区域的名字和mapcode推进历史记录数组setTimeout(function () {click_history_path_Arry = JSON.parse(localStorage.getItem('click_history_path_Arry'));console.log('获取第一次路径：', click_history_path_Arry);click_history_path_Arry.push({name: get_name,adcode: get_mapcode})click_history_path_Arry = _.uniqWith(click_history_path_Arry, _.isEqual);//利用loadsh进行数组去localStorage.setItem('click_history_path_Arry', JSON.stringify(click_history_path_Arry));console.log('历史路径:', click_history_path_Arry);//这个有路径}, 200)if (!mapCode) {alert('无此区域地图显示！！！');return;}loadMap(mapCode, name);}, 250);});// 绑定双击事件，返回全国地图myChart.on('dblclick', function (params) {//当双击事件发生时，清除单击事件，仅响应双击事件clearTimeout(timeFn);// 对历史路径中的元素进行去重var get_click_history_path_Arry = _.uniqWith(JSON.parse(localStorage.getItem('click_history_path_Arry')), _.isEqual)console.log('从本地获取的历史路径:', get_click_history_path_Arry);// 检查数组是否非空  if (get_click_history_path_Arry.length > 1) {// 获取倒数第二个元素的索引（因为JavaScript的索引是从0开始的）  const lastIndex = get_click_history_path_Arry.length - 2;// 访问该索引的name和adcode  const his_name = get_click_history_path_Arry[lastIndex].name;const his_adcode = get_click_history_path_Arry[lastIndex].adcode;// 打印结果  console.log('上传名字:', his_name);console.log('上传Adcode:', his_adcode);loadMap(his_adcode, his_name);const newAreas = get_click_history_path_Arry.slice(0, get_click_history_path_Arry.length - 1);localStorage.setItem('click_history_path_Arry', JSON.stringify(newAreas))//将删除后的数组覆盖掉本地原有的数组}else {alert('暂无历史记录.');}});</script>
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