這里只上部分js代碼: var city = require('../../utils/city.js'); Page({ data: { searchLetter: [], showLetter: "", winHeight: 0, tHeight: 0, bHeight: 0, startPageY: 0, cityList: [], isShowLetter: false, scrollTop: 0, city: "" }, onLoad: function (options) { // 生命周期函數--監聽頁面加載 var searchLetter = city.searchLetter; var cityList = city.cityList(); // console.log(cityInfo); var sysInfo = wx.getSystemInfoSync(); console.log(sysInfo); var winHeight = sysInfo.windowHeight; //添加要匹配的字母范圍值 //1、更加屏幕高度設置子元素的高度 var itemH = winHeight / searchLetter.length; var tempObj = []; for (var i = 0; i < searchLetter.length; i++) { var temp = {}; temp.name = searchLetter[i]; temp.tHeight = i * itemH; temp.bHeight = (i + 1) * itemH; tempObj.push(temp) } this.setData({ winHeight: winHeight, itemH: itemH, searchLetter: tempObj, cityList: cityList }) console.log(this.data.cityInfo); }, onReady: function () { // 生命周期函數--監聽頁面初次渲染完成 }, onShow: function () { // 生命周期函數--監聽頁面顯示 }, onHide: function () { // 生命周期函數--監聽頁面隱藏 }, onUnload: function () { // 生命周期函數--監聽頁面卸載 }, onPullDownRefresh: function () { // 頁面相關事件處理函數--監聽用戶下拉動作 }, onReachBottom: function () { // 頁面上拉觸底事件的處理函數 }, onShareAppMessage: function () { // 用戶點擊右上角分享 return { title: 'title', // 分享標題 desc: 'desc', // 分享描述 path: 'path' // 分享路徑 } }, searchStart: function (e) { var showLetter = e.currentTarget.dataset.letter; var pageY = e.touches[0].pageY; this.setScrollTop(this, showLetter); this.nowLetter(pageY, this); this.setData({ showLetter: showLetter, startPageY: pageY, isShowLetter: true, }) }, searchMove: function (e) { var pageY = e.touches[0].pageY; var startPageY = this.data.startPageY; var tHeight = this.data.tHeight; var bHeight = this.data.bHeight; var showLetter = 0; console.log(pageY); if (startPageY - pageY > 0) { //向上移動 if (pageY < tHeight) { // showLetter=this.mateLetter(pageY,this); this.nowLetter(pageY, this); } } else {//向下移動 if (pageY > bHeight) { // showLetter=this.mateLetter(pageY,this); this.nowLetter(pageY, this); } } }, searchEnd: function (e) { // console.log(e); // var showLetter=e.currentTarget.dataset.letter; var that = this; setTimeout(function () { that.setData({ isShowLetter: false }) }, 1000) }, nowLetter: function (pageY, that) {//當前選中的信息 var letterData = this.data.searchLetter; var bHeight = 0; var tHeight = 0; var showLetter = ""; for (var i = 0; i < letterData.length; i++) { if (letterData[i].tHeight <= pageY && pageY <= letterData[i].bHeight) { bHeight = letterData[i].bHeight; tHeight = letterData[i].tHeight; showLetter = letterData[i].name; break; } } this.setScrollTop(that, showLetter); that.setData({ bHeight: bHeight, tHeight: tHeight, showLetter: showLetter, startPageY: pageY }) }, bindScroll: function (e) { console.log(e.detail) }, setScrollTop: function (that, showLetter) { var scrollTop = 0; var cityList = that.data.cityList; var cityCount = 0; var initialCount = 0; for (var i = 0; i < cityList.length; i++) { if (showLetter == cityList[i].initial) { scrollTop = initialCount * 30 + cityCount * 41; break; } else { initialCount++; cityCount += cityList[i].cityInfo.length; } } that.setData({ scrollTop: scrollTop }) }, bindCity: function (e) { var city = e.currentTarget.dataset.city; this.setData({ city: city }) } }) 詳細代碼下載地址請點擊這里：[城市切換](http://www.see-source.com/weixinwidget/downloadZip.html?wid=81)