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js：
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) {
// 生命周期函数--监听页面加载
var searchLetter = c
