在微信小程序功能搭建中，按字母渲染城市会用到多个ES6的方法，如reduce，map，Object.entries()，Object.keys() ，需要组合熟练掌握，才能优雅的处理数据完成渲染。
目录
一、数据分析
二、数据处理
1、创建citiesByPre数组存储按 city_pre 分类的 cities
2、将cityList里面的值按键名划分成数组
3、 将 groupedCities 的键（city_pre）按照字母顺序排序
4、 将 sortedCitiesByPre 转换为数组并存储到 data 中
5、给this.data赋值
6、完整js代码
三、数据渲染
一、数据分析
首先我们拿到了一个数据庞大的对象数组，要把它渲染到页面上，只需要关注两个属性：city_name和city_pre
核心问题就是：
1、city_pre是乱序的，如何将city_pre相同的城市名，收集到同一个数组内方便区域渲染？
2、当相同的城市名在一个数组内，如何给每个数组添加一个属性，用来标识所渲染区域的标题？
二、数据处理
1、创建citiesByPre数组存储按 city_pre 分类的 cities
data: {citiesByPre: [], cityList: [{id: "1",city_name: "上海",city_pre: "S",city_pinyin: "Shanghai",city_short: "sh",count: "316",},{id: "2",city_name: "北京",city_pre: "B",city_pinyin: "Beijing",city_short: "bj",count: "208",},{id: "3",city_name: "深圳",city_pre: "S",city_pinyin: "Shenzhen",city_short: "sz",count: "252",},{id: "4",city_name: "重庆",city_pre: "C",city_pinyin: "Chongqing",city_short: "cq",count: "230",},{id: "5",city_name: "广州",city_pre: "G",city_pinyin: "Guangzhou",city_short: "gz",count: "177",},{id: "6",city_name: "成都",city_pre: "C",city_pinyin: "Chengdu",city_short: "cd",count: "166",},//更多城市数据..],},2、将cityList里面的值按键名划分成数组
groupAndSortCitiesByPre: function () {const groupedCities = this.data.cityList.reduce((acc, city) => {if (!acc[city.city_pre]) {acc[city.city_pre] = [];}acc[city.city_pre].push(city);return acc;}, {});console.log('分类后的数组:', groupedCities);}打印分类后的数组是这样的：
虽然按字母为键值将city.city_pre相同的放到了一个数组内，但字母的顺序是乱的。
if (!acc[city.city_pre])：如果累计值acc中没有对应的键，就将其赋值成数组。
以下是简单的小例子：
// 定义一个对象var acc = {};// 检查对象acc中是否已经存在键为A的属性if (!acc["A"]) {// 如果不存在，就添加这个键，并赋予一个值acc["A"] = [];}// 打印对象，看看结果console.log(acc);打印结果是：
3、 将 groupedCities 的键（city_pre）按照字母顺序排序
const sortedCitiesByPre = Object.keys(groupedCities) //取出键值.sort() //排序.reduce((acc, pre) => {acc[pre] = groupedCities[pre]; //"A":[对应的数组对象]return acc;}, {});// 打印 sortedCitiesByPre 对象console.log('排序后的数组:', sortedCitiesByPre);打印结果是：
顺序虽然对了，但不便于渲染。
4、 将 sortedCitiesByPre 转换为数组并存储到 data 中
const citiesByPreArray = Object.entries(sortedCitiesByPre).map(([key, value]) => ({title: key,cities: value}));打印结果是：
（1）Object.entries对象变数组格式
const obj = { 键1: "值1", 键2: "值2" };const entries = Object.entries(obj);console.log("🚀 ~ entries:", entries);打印结果是：
（2）map解构赋值转换成可渲染的格式
const entries = [["键1", "值1"],["键2", "值2"],];// 使用解构来获取键和值entries.map(([key, value]) => {console.log({ key, value });});打印结果是：
5、给this.data赋值
this.data: 这是一个只读的属性，表示当前页面的数据状态。你不能直接修改它的内容，因为这样不会触发视图的更新。this.setData(): 这是一个用于更新页面数据的方法。它接受一个对象作为参数，参数中的键是要更新的属性名，值是要设置的新值。当调用setData()时，框架会将数据更新到页面的data中，并自动重新渲染页面。
this.setData({citiesByPre: citiesByPreArray});6、完整js代码
// pages/city/city.js
Page({data: {citiesByPre: [], // 1、存储按 city_pre 分类的 citiescityList: [{id: "1",city_name: "上海",city_pre: "S",city_pinyin: "Shanghai",city_short: "sh",count: "316",},{id: "2",city_name: "北京",city_pre: "B",city_pinyin: "Beijing",city_short: "bj",count: "208",},{id: "3",city_name: "深圳",city_pre: "S",city_pinyin: "Shenzhen",city_short: "sz",count: "252",},{id: "4",city_name: "重庆",city_pre: "C",city_pinyin: "Chongqing",city_short: "cq",count: "230",},{id: "5",city_name: "广州",city_pre: "G",city_pinyin: "Guangzhou",city_short: "gz",count: "177",},{id: "6",city_name: "成都",city_pre: "C",city_pinyin: "Chengdu",city_short: "cd",count: "166",},{id: "7",city_name: "武汉",city_pre: "W",city_pinyin: "Wuhan",city_short: "wh",count: "124",},{id: "8",city_name: "东莞",city_pre: "D",city_pinyin: "Dongguan",city_short: "dg",count: "131",},{id: "9",city_name: "天津",city_pre: "T",city_pinyin: "Tianjin",city_short: "tj",count: "95",},{id: "10",city_name: "杭州",city_pre: "H",city_pinyin: "Hangzhou",city_short: "hz",count: "158",},{id: "11",city_name: "沈阳",city_pre: "S",city_pinyin: "Shenyang",city_short: "sy",count: "72",},{id: "12",city_name: "佛山",city_pre: "F",city_pinyin: "Foshan",city_short: "fs",count: "115",},{id: "13",city_name: "合肥",city_pre: "H",city_pinyin: "Hefei",city_short: "hf",count: "82",},{id: "14",city_name: "南京",city_pre: "N",city_pinyin: "Nanjing",city_short: "nj",count: "98",},{id: "15",city_name: "长沙",city_pre: "C",city_pinyin: "Changsha",city_short: "cs",count: "94",},{id: "16",city_name: "西安",city_pre: "X",city_pinyin: "Xian",city_short: "xa",count: "108",},{id: "17",city_name: "郑州",city_pre: "Z",city_pinyin: "Zhengzhou",city_short: "zz",count: "97",},{id: "18",city_name: "宁波",city_pre: "N",city_pinyin: "Ningbo",city_short: "nb",count: "69",},{id: "19",city_name: "大连",city_pre: "D",city_pinyin: "Dalian",city_short: "dl",count: "55",},{id: "20",city_name: "青岛",city_pre: "Q",city_pinyin: "QingDao",city_short: "qd",count: "63",},{id: "21",city_name: "苏州",city_pre: "S",city_pinyin: "Suzhou",city_short: "sz",count: "81",},{id: "22",city_name: "温州",city_pre: "W",city_pinyin: "Wenzhou",city_short: "wz",count: "79",},{id: "23",city_name: "厦门",city_pre: "X",city_pinyin: "Xiamen",city_short: "xm",count: "48",},{id: "24",city_name: "惠州",city_pre: "H",city_pinyin: "Huizhou",city_short: "hz",count: "50",},{id: "25",city_name: "福州",city_pre: "F",city_pinyin: "Fuzhou",city_short: "fz",count: "47",},{id: "26",city_name: "昆明",city_pre: "K",city_pinyin: "Kunming",city_short: "km",count: "70",},{id: "27",city_name: "无锡",city_pre: "W",city_pinyin: "Wuxi",city_short: "wx",count: "65",},{id: "28",city_name: "烟台",city_pre: "Y",city_pinyin: "Yantai",city_short: "yt",count: "34",},{id: "29",city_name: "南昌",city_pre: "N",city_pinyin: "Nanchang",city_short: "nc",count: "50",},{id: "30",city_name: "石家庄",city_pre: "S",city_pinyin: "Shijiazhuang",city_short: "sjz",count: "66",},{id: "31",city_name: "常州",city_pre: "C",city_pinyin: "Changzhou",city_short: "cz",count: "45",},{id: "32",city_name: "济南",city_pre: "J",city_pinyin: "Jinan",city_short: "jn",count: "45",},{id: "33",city_name: "兰州",city_pre: "L",city_pinyin: "Lanzhou",city_short: "lz",count: "35",},{id: "34",city_name: "台州",city_pre: "T",city_pinyin: "Taizhou",city_short: "tz",count: "60",},{id: "35",city_name: "南宁",city_pre: "N",city_pinyin: "Nanning",city_short: "nn",count: "46",},{id: "36",city_name: "中山",city_pre: "Z",city_pinyin: "Zhongshan",city_short: "zs",count: "61",},{id: "37",city_name: "贵阳",city_pre: "G",city_pinyin: "Guiyang",city_short: "gy",count: "36",},{id: "38",city_name: "太原",city_pre: "T",city_pinyin: "Taiyuan",city_short: "ty",count: "36",},{id: "39",city_name: "南通",city_pre: "N",city_pinyin: "Nantong",city_short: "nt",count: "62",},{id: "40",city_name: "丽水",city_pre: "L",city_pinyin: "Lishui",city_short: "ls",count: "31",},{id: "41",city_name: "芜湖",city_pre: "W",city_pinyin: "Wuhu",city_short: "wh",count: "41",},{id: "42",city_name: "乌鲁木齐",city_pre: "W",city_pinyin: "Wulumuqi",city_short: "wlmq",count: "39",},{id: "43",city_name: "盐城",city_pre: "Y",city_pinyin: "Yancheng",city_short: "yc",count: "34",},{id: "44",city_name: "新乡",city_pre: "X",city_pinyin: "Xinxiang",city_short: "xx",count: "29",},{id: "45",city_name: "江门",city_pre: "J",city_pinyin: "Jiangmen",city_short: "jm",count: "39",},{id: "46",city_name: "长春",city_pre: "C",city_pinyin: "Changchun",city_short: "cc",count: "48",},{id: "47",city_name: "洛阳",city_pre: "L",city_pinyin: "Luoyang",city_short: "ly",count: "30",},{id: "48",city_name: "赣州",city_pre: "G",city_pinyin: "Ganzhou",city_short: "gz",count: "44",},{id: "49",city_name: "淄博",city_pre: "Z",city_pinyin: "Zibo",city_short: "zb",count: "24",},{id: "50",city_name: "银川",city_pre: "Y",city_pinyin: "Yinchuan",city_short: "yc",count: "28",},{id: "51",city_name: "淮安",city_pre: "H",city_pinyin: "Huaian",city_short: "ha",count: "33",},{id: "52",city_name: "哈尔滨",city_pre: "H",city_pinyin: "Harbin",city_short: "heb",count: "51",},{id: "53",city_name: "衢州",city_pre: "Q",city_pinyin: "Quzhou",city_short: "qz",count: "22",},{id: "54",city_name: "威海",city_pre: "W",city_pinyin: "Weihai",city_short: "wh",count: "23",},{id: "55",city_name: "泉州",city_pre: "Q",city_pinyin: "Quanzhou",city_short: "qz",count: "40",},{id: "56",city_name: "唐山",city_pre: "T",city_pinyin: "Tangshan",city_short: "ts",count: "31",},{id: "57",city_name: "湖州",city_pre: "H",city_pinyin: "Huzhou",city_short: "hz",count: "39",},{id: "58",city_name: "徐州",city_pre: "X",city_pinyin: "Xuzhou",city_short: "xz",count: "43",},{id: "59",city_name: "大庆",city_pre: "D",city_pinyin: "Daqing",city_short: "dq",count: "31",},{id: "60",city_name: "临沂",city_pre: "L",city_pinyin: "Linyi",city_short: "ly",count: "39",},{id: "61",city_name: "株洲",city_pre: "Z",city_pinyin: "Zhuzhou",city_short: "zz",count: "22",},{id: "62",city_name: "上饶",city_pre: "S",city_pinyin: "Shangrao",city_short: "sr",count: "39",},{id: "63",city_name: "常德",city_pre: "C",city_pinyin: "Changde",city_short: "cd",count: "40",},{id: "64",city_name: "榆林",city_pre: "Y",city_pinyin: "Yulin",city_short: "yl",count: "25",},{id: "65",city_name: "潍坊",city_pre: "W",city_pinyin: "Weifang",city_short: "wf",count: "24",},{id: "66",city_name: "邯郸",city_pre: "H",city_pinyin: "Handan",city_short: "hd",count: "31",},{id: "67",city_name: "岳阳",city_pre: "Y",city_pinyin: "Yueyang",city_short: "yy",count: "28",},{id: "68",city_name: "衡阳",city_pre: "H",city_pinyin: "Hengyang",city_short: "hy",count: "28",},{id: "69",city_name: "珠海",city_pre: "Z",city_pinyin: "Zhuhai",city_short: "zh",count: "30",},{id: "70",city_name: "东营",city_pre: "D",city_pinyin: "Dongying",city_short: "dy",count: "17",},{id: "71",city_name: "郴州",city_pre: "C",city_pinyin: "Chenzhou",city_short: "cz",count: "34",},{id: "72",city_name: "绍兴",city_pre: "S",city_pinyin: "Shaoxing",city_short: "sx",count: "28",},{id: "73",city_name: "南充",city_pre: "N",city_pinyin: "Nanchong",city_short: "nc",count: "30",},{id: "74",city_name: "扬州",city_pre: "Y",city_pinyin: "Yangzhou",city_short: "yz",count: "31",},{id: "75",city_name: "马鞍山",city_pre: "M",city_pinyin: "Maanshan",city_short: "mas",count: "26",},{id: "76",city_name: "宜春",city_pre: "Y",city_pinyin: "Yichun",city_short: "yc",count: "27",},{id: "77",city_name: "湛江",city_pre: "Z",city_pinyin: "Zhanjiang",city_short: "zj",count: "24",},{id: "78",city_name: "十堰",city_pre: "S",city_pinyin: "Shiyan",city_short: "sy",count: "20",},{id: "79",city_name: "海口",city_pre: "H",city_pinyin: "Haikou",city_short: "hk",count: "30",},{id: "80",city_name: "运城",city_pre: "Y",city_pinyin: "Yuncheng",city_short: "yc",count: "29",},{id: "81",city_name: "菏泽",city_pre: "H",city_pinyin: "Heze",city_short: "hz",count: "23",},{id: "82",city_name: "九江",city_pre: "J",city_pinyin: "Jiujiang",city_short: "jj",count: "37",},{id: "83",city_name: "南阳",city_pre: "N",city_pinyin: "Nanyang",city_short: "ny",count: "35",},{id: "84",city_name: "昆山",city_pre: "K",city_pinyin: "Kunshan",city_short: "ks",count: "21",},{id: "85",city_name: "桂林",city_pre: "G",city_pinyin: "Guilin",city_short: "gl",count: "31",},{id: "86",city_name: "金华",city_pre: "J",city_pinyin: "Jinhua",city_short: "jh",count: "32",},{id: "87",city_name: "湘潭",city_pre: "X",city_pinyin: "Xiangtan",city_short: "xt",count: "21",},{id: "88",city_name: "济宁",city_pre: "J",city_pinyin: "Jining",city_short: "jn",count: "22",},{id: "89",city_name: "西宁",city_pre: "X",city_pinyin: "Xining",city_short: "xn",count: "19",},{id: "90",city_name: "遵义",city_pre: "Z",city_pinyin: "Zunyi",city_short: "zy",count: "30",},{id: "91",city_name: "红河",city_pre: "H",city_pinyin: "Honghe",city_short: "hh",count: "22",},{id: "92",city_name: "张家口",city_pre: "Z",city_pinyin: "Zhangjiakou",city_short: "zjk",count: "23",},{id: "93",city_name: "呼和浩特",city_pre: "H",city_pinyin: "Hohhot",city_short: "hhht",count: "31",},{id: "94",city_name: "娄底",city_pre: "L",city_pinyin: "Loudi",city_short: "ld",count: "14",},{id: "95",city_name: "滁州",city_pre: "C",city_pinyin: "Chuzhou",city_short: "cz",count: "26",},{id: "96",city_name: "安庆",city_pre: "A",city_pinyin: "Anqing",city_short: "aq",count: "23",},{id: "97",city_name: "肇庆",city_pre: "Z",city_pinyin: "Zhaoqing",city_short: "zq",count: "20",},{id: "98",city_name: "宿迁",city_pre: "S",city_pinyin: "Suqian",city_short: "sq",count: "25",},{id: "99",city_name: "汕头",city_pre: "S",city_pinyin: "Shantou",city_short: "st",count: "28",},{id: "100",city_name: "绵阳",city_pre: "M",city_pinyin: "Mianyang",city_short: "my",count: "24",},{id: "101",city_name: "信阳",city_pre: "X",city_pinyin: "Xinyang",city_short: "xy",count: "20",},{id: "102",city_name: "新余",city_pre: "X",city_pinyin: "Xinyu",city_short: "xy",count: "11",},{id: "103",city_name: "嘉兴",city_pre: "J",city_pinyin: "Jiaxing",city_short: "jx",count: "33",},{id: "104",city_name: "怀化",city_pre: "H",city_pinyin: "Huaihua",city_short: "hh",count: "25",},{id: "105",city_name: "保定",city_pre: "B",city_pinyin: "Baoding",city_short: "bd",count: "28",},{id: "106",city_name: "黄石",city_pre: "H",city_pinyin: "Huangshi",city_short: "hs",count: "13",},{id: "107",city_name: "黄山",city_pre: "H",city_pinyin: "Huangshan",city_short: "hs",count: "16",},{id: "108",city_name: "平顶山",city_pre: "P",city_pinyin: "Pingdingshan",city_short: "pds",count: "24",},{id: "109",city_name: "焦作",city_pre: "J",city_pinyin: "Jiaozuo",city_short: "jz",count: "22",},{id: "110",city_name: "镇江",city_pre: "Z",city_pinyin: "Zhenjiang",city_short: "zj",count: "18",},{id: "111",city_name: "日照",city_pre: "R",city_pinyin: "Rizhao",city_short: "rz",count: "16",},{id: "112",city_name: "安阳",city_pre: "A",city_pinyin: "Anyang",city_short: "ay",count: "14",},{id: "113",city_name: "龙岩",city_pre: "L",city_pinyin: "Longyan",city_short: "ly",count: "15",},{id: "114",city_name: "六安",city_pre: "L",city_pinyin: "luan",city_short: "la",count: "24",},{id: "115",city_name: "吴江",city_pre: "W",city_pinyin: "Wujiang",city_short: "wj",count: "8",},{id: "116",city_name: "吉安",city_pre: "J",city_pinyin: "Jian",city_short: "ja",count: "25",},{id: "117",city_name: "舟山",city_pre: "Z",city_pinyin: "Zhoushan",city_short: "zs",count: "15",},{id: "118",city_name: "滨州",city_pre: "B",city_pinyin: "Binzhou",city_short: "bz",count: "14",},{id: "119",city_name: "柳州",city_pre: "L",city_pinyin: "Liuzhou",city_short: "lz",count: "21",},{id: "120",city_name: "连云港",city_pre: "L",city_pinyin: "Lianyungang",city_short: "lyg",count: "20",},{id: "121",city_name: "三明",city_pre: "S",city_pinyin: "Sanming",city_short: "sm",count: "18",},{id: "122",city_name: "包头",city_pre: "B",city_pinyin: "Baotou",city_short: "bt",count: "21",},{id: "123",city_name: "盘锦",city_pre: "P",city_pinyin: "Panjin",city_short: "pj",count: "11",},{id: "124",city_name: "江阴",city_pre: "J",city_pinyin: "Jiangyin",city_short: "jy",count: "18",},{id: "125",city_name: "余姚",city_pre: "Y",city_pinyin: "Yuyao",city_short: "yy",count: "10",},{id: "126",city_name: "枣庄",city_pre: 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"Lufeng",city_short: "lf",count: "1",},{id: "7658",city_name: "清镇",city_pre: "Q",city_pinyin: "Qingzhen",city_short: "qz",count: "1",},{id: "8197",city_name: "辉县",city_pre: "H",city_pinyin: "Huixian",city_short: "hx",count: "2",},{id: "9039",city_name: "甘孜",city_pre: "G",city_pinyin: "Ganzi",city_short: "gz",count: "10",},{id: "9117",city_name: "凉山",city_pre: "L",city_pinyin: "Liangshan",city_short: "ls",count: "5",},{id: "9161",city_name: "阿拉善",city_pre: "A",city_pinyin: "Alashan",city_short: "als",count: "4",},{id: "9293",city_name: "兴安",city_pre: "X",city_pinyin: "Xingan",city_short: "xa",count: "2",},{id: "9294",city_name: "新乐",city_pre: "X",city_pinyin: "Xinle",city_short: "xl",count: "2",},{id: "9306",city_name: "白沙",city_pre: "B",city_pinyin: "baisha",city_short: "bs",count: "1",},{id: "9316",city_name: "定安县",city_pre: "D",city_pinyin: "dinganxian",city_short: "dax",count: "1",},{id: "9334",city_name: "凌源",city_pre: "L",city_pinyin: "Lingyuan",city_short: "ly",count: "2",},{id: "9343",city_name: "密山",city_pre: "M",city_pinyin: "Mishan",city_short: "ms",count: "1",},{id: "9344",city_name: "南雄",city_pre: "N",city_pinyin: "Nanxiong",city_short: "nx",count: "1",},{id: "9346",city_name: "彭州市",city_pre: "P",city_pinyin: "Pengzhoushi",city_short: "pzs",count: "1",},{id: "9645",city_name: "阿坝",city_pre: "A",city_pinyin: "Aba",city_short: "ab",count: "8",},{id: "9672",city_name: "普洱",city_pre: "P",city_pinyin: "puer",city_short: "",count: "7",},{id: "9767",city_name: "德令哈",city_pre: "D",city_pinyin: "Delingha",city_short: "dlh",count: "3",},{id: "9795",city_name: "怒江",city_pre: "N",city_pinyin: "Nujiang",city_short: "nj",count: "4",},{id: "9822",city_name: "阿拉尔",city_pre: "A",city_pinyin: "Alaer",city_short: "ale",count: "2",},{id: "9825",city_name: "博尔塔拉",city_pre: "B",city_pinyin: "boertala",city_short: "bedl",count: "2",},{id: "9846",city_name: "海南藏族自治州",city_pre: "H",city_pinyin: "Hainanzangzuzizhizhou",city_short: "hnczzzz",count: "2",},{id: "9856",city_name: "克孜勒",city_pre: "K",city_pinyin: "kezile",city_short: "kzl",count: "2",},{id: "9875",city_name: "沭阳",city_pre: "S",city_pinyin: "Shuyang",city_short: "sy",count: "2",},{id: "9898",city_name: "昌都",city_pre: "C",city_pinyin: "Changdu",city_short: "cd",count: "1",},{id: "9910",city_name: "海北",city_pre: "H",city_pinyin: "haibei",city_short: "hb",count: "1",},{id: "9917",city_name: "井冈山",city_pre: "J",city_pinyin: "Jinggangshan",city_short: "jgs",count: "1",},{id: "9922",city_name: "林芝",city_pre: "L",city_pinyin: "Linzhi",city_short: "lz",count: "1",},{id: "9932",city_name: "栖霞",city_pre: "Q",city_pinyin: "Qixia",city_short: "qx",count: "1",},{id: "9934",city_name: "瑞丽",city_pre: "R",city_pinyin: "Ruili",city_short: "rl",count: "1",},{id: "9937",city_name: "山南",city_pre: "S",city_pinyin: "Shannan",city_short: "sn",count: "1",},{id: "9944",city_name: "卫辉",city_pre: "W",city_pinyin: "Weihui",city_short: "wh",count: "1",},{id: "9953",city_name: "玉树",city_pre: "Y",city_pinyin: "yushu",city_short: "ys",count: "1",},{id: "11695",city_name: "舒兰",city_pre: "S",city_pinyin: "Shulan",city_short: "sl",count: "1",},{id: "11703",city_name: "武夷山",city_pre: "W",city_pinyin: "Wuyishan",city_short: "wys",count: "1",},{id: "12272",city_name: "石首",city_pre: "S",city_pinyin: "Shishou",city_short: "ds",count: "1",},{id: "12833",city_name: "海阳",city_pre: "H",city_pinyin: "Haiyang",city_short: "hy",count: "1",},],},onLoad: function () {this.groupAndSortCitiesByPre();},groupAndSortCitiesByPre: function () {// 2、将cityList里面的值按键名一个个划分成数组const groupedCities = this.data.cityList.reduce((acc, city) => {if (!acc[city.city_pre]) {acc[city.city_pre] = [];}acc[city.city_pre].push(city);return acc;}, {});// 3、将 groupedCities 的键（city_pre）按照字母顺序排序const sortedCitiesByPre = Object.keys(groupedCities) //取出键值.sort() //排序.reduce((acc, pre) => {acc[pre] = groupedCities[pre]; //"A":[对应的数组对象]return acc;}, {});// console.log('排序后的数组:', sortedCitiesByPre);// 4、将 sortedCitiesByPre 转换为数组并存储到 data 中const citiesByPreArray = Object.entries(sortedCitiesByPre).map(([key, value]) => ({title: key,cities: value}));console.log('转化格式的数组:', citiesByPreArray);// 5、给this.data赋值this.setData({citiesByPre: citiesByPreArray});}
})三、数据渲染
<block>组件是一个容器，但它不会被渲染成实际的 DOM 节点。<block>相当于是一个不可见的占位符，它不会在页面的布局中占据空间。- 使用
<block>可以避免创建不必要的 DOM 节点，从而提高页面性能，特别是在循环渲染大量列表时。 <block>组件本身是不可以设置宽高样式的，因为它不会产生实际的DOM节点，所以任何对宽高样式的设置都不会生效。<block>主要用于逻辑分组，不参与页面布局。
<block wx:for="{{citiesByPre}}" wx:key="pre"><view class="title">{{item.title}}</view><view class="cityArea"><block wx:for="{{item.cities}}" wx:key="id"><text class="item">{{item.city_name}}</text></block></view>
</block>城市点击跳转请看：微信小程序 城市点击后跳转 并首页显示被点击城市-CSDN博客
