js：
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var city = require('../../utils/city.js');
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Page({
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data: {
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searchLetter: [],
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showLetter: "",
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winHeight: 0,
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tHeight:0,
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bHeight:0,
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startPageY:0,
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cityList:[],
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isShowLetter:false,
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scrollTop:0,
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city:""
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},
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onLoad: function (options) {
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// 生命周期函数--监听页面加载
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var searchLetter = city.searchLetter;
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var cityList=city.cityList();
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// console.log(cityInfo);
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var sysInfo = wx.getSystemInfoSync();
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console.log(sysInfo);
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var winHeight = sysInfo.windowHeight;
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//添加要匹配的字母范围值
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//1、更加屏幕高度设置子元素的高度
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var itemH = winHeight / searchLetter.length;
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var tempObj = [];
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for (var i = 0; i < searchLetter.length; i++) {
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var temp = {};
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temp.name = searchLetter[i];
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