贵州网站建站,微信网站响应式网站,wordpress 获取某个分类的文章,培训医院网站建设在微信小程序功能搭建中#xff0c;按字母渲染城市会用到多个ES6的方法#xff0c;如reduce#xff0c;map#xff0c;Object.entries()#xff0c;Object.keys() #xff0c;需要组合熟练掌握#xff0c;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 … 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reducemapObject.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 1Object.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 2map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: 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Qingyang,city_short: qy,count: 11,},{id: 482,city_name: 汝州,city_pre: R,city_pinyin: Ruzhou,city_short: rz,count: 1,},{id: 483,city_name: 乳山,city_pre: R,city_pinyin: Rushan,city_short: rs,count: 1,},{id: 484,city_name: 瑞昌,city_pre: R,city_pinyin: Ruichang,city_short: rc,count: 3,},{id: 485,city_name: 邵武,city_pre: S,city_pinyin: Shaowu,city_short: sw,count: 3,},{id: 486,city_name: 尚志,city_pre: S,city_pinyin: Shangzhi,city_short: sz,count: 2,},{id: 487,city_name: 上高市,city_pre: S,city_pinyin: Shanggaoshi,city_short: sgs,count: 1,},{id: 488,city_name: 曲阜,city_pre: Q,city_pinyin: Qufu,city_short: qf,count: 2,},{id: 489,city_name: 邛崃,city_pre: Q,city_pinyin: Qionglai,city_short: ql,count: 1,},{id: 490,city_name: 琼海,city_pre: Q,city_pinyin: Qionghai,city_short: qh,count: 4,},{id: 491,city_name: 荣成,city_pre: R,city_pinyin: Rongcheng,city_short: rc,count: 2,},{id: 492,city_name: 仁怀,city_pre: R,city_pinyin: Renhuai,city_short: rh,count: 1,},{id: 493,city_name: 澄迈县,city_pre: C,city_pinyin: Chengmaixian,city_short: cmx,count: 2,},{id: 494,city_name: 调兵山,city_pre: D,city_pinyin: Diaobingshan,city_short: dbs,count: 2,},{id: 495,city_name: 巩义,city_pre: G,city_pinyin: Gongyi,city_short: gy,count: 2,},{id: 496,city_name: 万宁,city_pre: W,city_pinyin: Wanning,city_short: wn,count: 1,},{id: 975,city_name: 高州,city_pre: G,city_pinyin: Gaozhou,city_short: gz,count: 3,},{id: 976,city_name: 伊春,city_pre: Y,city_pinyin: Yichun,city_short: yc,count: 4,},{id: 977,city_name: 章丘,city_pre: Z,city_pinyin: Zhangqiu,city_short: zq,count: 3,},{id: 978,city_name: 常宁,city_pre: C,city_pinyin: Changning,city_short: cn,count: 1,},{id: 979,city_name: 福鼎,city_pre: F,city_pinyin: Fuding,city_short: fd,count: 1,},{id: 980,city_name: 广水,city_pre: G,city_pinyin: Guangshui,city_short: as,count: 4,},{id: 981,city_name: 广安,city_pre: G,city_pinyin: Guangan,city_short: ga,count: 9,},{id: 982,city_name: 介休,city_pre: J,city_pinyin: Jiexiu,city_short: jx,count: 2,},{id: 983,city_name: 临夏,city_pre: L,city_pinyin: Linxia,city_short: lx,count: 9,},{id: 984,city_name: 海东,city_pre: H,city_pinyin: haidong,city_short: hd,count: 6,},{id: 985,city_name: 乐清,city_pre: L,city_pinyin: Leqing,city_short: lq,count: 6,},{id: 986,city_name: 吐鲁番,city_pre: T,city_pinyin: Turpan,city_short: tlf,count: 3,},{id: 987,city_name: 屯昌县,city_pre: T,city_pinyin: Tunchangxian,city_short: tcx,count: 2,},{id: 988,city_name: 双辽,city_pre: S,city_pinyin: Shuangliao,city_short: sl,count: 3,},{id: 989,city_name: 定州,city_pre: D,city_pinyin: Dingzhou,city_short: dz,count: 4,},{id: 990,city_name: 黔西南州,city_pre: Q,city_pinyin: Qianxinan,city_short: qxn,count: 10,},{id: 991,city_name: 崇左,city_pre: C,city_pinyin: Chongzuo,city_short: cz,count: 8,},{id: 992,city_name: 乌兰察布,city_pre: W,city_pinyin: Wulanchabu,city_short: wlcb,count: 12,},{id: 993,city_name: 昭通,city_pre: Z,city_pinyin: Zhaotong,city_short: zt,count: 7,},{id: 994,city_name: 德宏,city_pre: D,city_pinyin: Dehong,city_short: dh,count: 8,},{id: 995,city_name: 七台河,city_pre: Q,city_pinyin: Qitaihe,city_short: qth,count: 3,},{id: 996,city_name: 敦化,city_pre: D,city_pinyin: Dunhua,city_short: dh,count: 6,},{id: 997,city_name: 克拉玛依,city_pre: K,city_pinyin: Karamay,city_short: klmy,count: 4,},{id: 998,city_name: 东方,city_pre: D,city_pinyin: dongfang,city_short: df,count: 3,},{id: 999,city_name: 高密,city_pre: G,city_pinyin: Gaomi,city_short: gm,count: 1,},{id: 1000,city_name: 公主岭,city_pre: G,city_pinyin: Gongzhuling,city_short: gzl,count: 5,},{id: 1001,city_name: 海城,city_pre: H,city_pinyin: Haicheng,city_short: hc,count: 2,},{id: 1002,city_name: 阿勒泰,city_pre: A,city_pinyin: Aletai,city_short: alt,count: 3,},{id: 1003,city_name: 任丘,city_pre: R,city_pinyin: Renqiu,city_short: rq,count: 3,},{id: 1004,city_name: 双城,city_pre: S,city_pinyin: Shuangcheng,city_short: sc,count: 2,},{id: 1005,city_name: 庄河,city_pre: Z,city_pinyin: Zhuanghe,city_short: zh,count: 2,},{id: 1006,city_name: 当阳,city_pre: D,city_pinyin: Dangyang,city_short: dy,count: 1,},{id: 1007,city_name: 华阴,city_pre: H,city_pinyin: Huayin,city_short: hy,count: 1,},{id: 1008,city_name: 阆中,city_pre: L,city_pinyin: Langzhong,city_short: lz,count: 2,},{id: 1009,city_name: 霍州,city_pre: H,city_pinyin: Huozhou,city_short: hz,count: 1,},{id: 1010,city_name: 桦甸,city_pre: H,city_pinyin: Huadian,city_short: hd,count: 3,},{id: 1011,city_name: 吉首,city_pre: J,city_pinyin: Jishou,city_short: js,count: 1,},{id: 1012,city_name: 哈密,city_pre: H,city_pinyin: Hami,city_short: hm,count: 6,},{id: 1013,city_name: 河间,city_pre: H,city_pinyin: Hejian,city_short: hj,count: 1,},{id: 1014,city_name: 巴音郭楞,city_pre: B,city_pinyin: bayinguoleng,city_short: bygl,count: 3,},{id: 1015,city_name: 简阳,city_pre: J,city_pinyin: Jianyang,city_short: jy,count: 2,},{id: 1016,city_name: 北安,city_pre: B,city_pinyin: Beian,city_short: ba,count: 2,},{id: 1017,city_name: 沅江,city_pre: Y,city_pinyin: Yuanjiang,city_short: yj,count: 1,},{id: 1018,city_name: 天长,city_pre: T,city_pinyin: Tianchang,city_short: tc,count: 1,},{id: 1019,city_name: 洮南,city_pre: T,city_pinyin: Taonan,city_short: tn,count: 2,},{id: 1020,city_name: 大兴安岭,city_pre: D,city_pinyin: Daxinganling,city_short: dxal,count: 4,},{id: 1021,city_name: 图门,city_pre: T,city_pinyin: Tumen,city_short: tm,count: 1,},{id: 1022,city_name: 甘南,city_pre: G,city_pinyin: Gannan,city_short: gn,count: 9,},{id: 1023,city_name: 福安,city_pre: F,city_pinyin: Fuan,city_short: fa,count: 3,},{id: 1024,city_name: 大冶,city_pre: D,city_pinyin: Daye,city_short: dy,count: 1,},{id: 1025,city_name: 时光市,city_pre: S,city_pinyin: Shiguangshi,city_short: sgs,count: 7,},{id: 1026,city_name: 东兴,city_pre: D,city_pinyin: Dongxing,city_short: dx,count: 2,},{id: 1027,city_name: 瑞金,city_pre: R,city_pinyin: Ruijin,city_short: rj,count: 2,},{id: 1028,city_name: 汨罗,city_pre: M,city_pinyin: Miluo,city_short: ml,count: 2,},{id: 1029,city_name: 辛集,city_pre: X,city_pinyin: Xinji,city_short: xj,count: 1,},{id: 1030,city_name: 新密,city_pre: X,city_pinyin: Xinmi,city_short: xm,count: 1,},{id: 1031,city_name: 延吉,city_pre: Y,city_pinyin: Yanji,city_short: yj,count: 3,},{id: 1032,city_name: 老河口,city_pre: L,city_pinyin: Laohekou,city_short: lhk,count: 2,},{id: 1033,city_name: 昌江,city_pre: C,city_pinyin: changjiang,city_short: cj,count: 1,},{id: 1034,city_name: 乐东,city_pre: L,city_pinyin: ledong,city_short: ld,count: 3,},{id: 1035,city_name: 锡林郭勒,city_pre: X,city_pinyin: Xilinguole,city_short: xlgl,count: 6,},{id: 1036,city_name: 五常,city_pre: W,city_pinyin: Wuchang,city_short: wc,count: 1,},{id: 1037,city_name: 五大连池,city_pre: W,city_pinyin: Wudalianchi,city_short: wdlc,count: 1,},{id: 1038,city_name: 文昌,city_pre: W,city_pinyin: wenchang,city_short: wc,count: 3,},{id: 1039,city_name: 临湘,city_pre: L,city_pinyin: Linxiang,city_short: lx,count: 1,},{id: 1040,city_name: 龙井,city_pre: L,city_pinyin: Longjing,city_short: lj,count: 1,},{id: 1041,city_name: 高碑店,city_pre: G,city_pinyin: Gaobeidian,city_short: gbd,count: 2,},{id: 1042,city_name: 潞城,city_pre: L,city_pinyin: Lucheng,city_short: lc,count: 1,},{id: 1589,city_name: 恩平,city_pre: E,city_pinyin: Enping,city_short: ep,count: 1,},{id: 2634,city_name: 台山,city_pre: T,city_pinyin: Taishan,city_short: ts,count: 1,},{id: 3194,city_name: 雷州,city_pre: L,city_pinyin: Leizhou,city_short: lz,count: 1,},{id: 3735,city_name: 黑河,city_pre: H,city_pinyin: Heihe,city_short: hh,count: 3,},{id: 3777,city_name: 新郑,city_pre: X,city_pinyin: Xinzheng,city_short: xz,count: 3,},{id: 4277,city_name: 德惠,city_pre: D,city_pinyin: Dehui,city_short: dh,count: 2,},{id: 4295,city_name: 蛟河,city_pre: J,city_pinyin: Jiaohe,city_short: jh,count: 2,},{id: 4304,city_name: 林州,city_pre: L,city_pinyin: Linzhou,city_short: lz,count: 2,},{id: 4311,city_name: 磐石,city_pre: P,city_pinyin: Panshi,city_short: pd,count: 3,},{id: 5398,city_name: 二连浩特,city_pre: E,city_pinyin: Elianhot,city_short: elht,count: 1,},{id: 5968,city_name: 莱西,city_pre: L,city_pinyin: Laixi,city_short: lx,count: 1,},{id: 5982,city_name: 黔东南,city_pre: Q,city_pinyin: Qiandongnan,city_short: qdn,count: 13,},{id: 6536,city_name: 陆丰,city_pre: L,city_pinyin: 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:keypreview classtitle{{item.title}}/viewview classcityAreablock wx:for{{item.cities}} wx:keyidtext classitem{{item.city_name}}/text/block/view
/block
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