获取城市首字母排序，按字母顺序排序

<template>
	<view class="address-wrap" id="address">
		<!-- 搜索输入框-end -->
		<template v-if="!isSearch">
			<!-- 城市列表-start -->
			<view class="address-scroll">
				<!-- 当前城市 -->
				<view class="address-currentcity" id="start">
					<view class="address-currentcity-title">当前城市</view>
					<view class="choosecity-item-li-item" :class="isSelectAreaId== 'start'? 'is-active': ''">
						<image class="icon-dingwei" src="@/static/image/icon-dingwei.png" mode="widthFix"></image>
						<text style="margin-left: 8.5px;">上海</text>
					</view>
				</view>
				<!-- 选择城市 -->
				<view class="address-choosecity">
					<view class="address-choosecity-title">选择城市</view>
					<view class="address-choosecity-con">
						<template v-for="(item,index) in cityList">
							<view class="address-choosecity-item" :key="index" :id="index">
								<view class="choosecity-item-title">{{index}}</view>
								<view class="flex-fs-left choosecity-item-li">
									<template v-for="value in item">
									  <view class="choosecity-item-li-item line1" 
									  :class="isSelectAreaId==value.id?'is-active': ''" 
									  :key="value.name" @click="chooseCityHandle(value)">{{value.name}}</view>
									</template>
								</view>
							</view>
						</template>
					</view>
				</view>
			</view>
			<!-- 城市列表-end -->
			<!-- 对应字母 -->
			<view class="address-letter">
				<view class="address-letter-item" @click="scrollHandle('start')">
					<image class="letter-image" v-if="isLetterIndex== 'start'" src="@/static/image/tiny-spot.png" mode="widthFix"></image>
					<image class="letter-image" v-else src="@/static/image/tiny-spot1.png" mode="widthFix"></image>
				</view>
				<template v-for="(item,index) in cityList">
				   <view class="address-letter-item" :class="isLetterIndex==index? 'is-active': ''" :key="index" @click="scrollHandle(index)">{{index}}</view>
				</template>
			</view>
		</template>
	</view>
</template>

<script>
	import { pinyin } from 'pinyin-pro';
	import { mapGetters, mapMutations } from "vuex";
	import { getHotArea } from '@/api/commonApi.js'
	export default {
		data() {
			return {
				searchVal:'',
				cityList:{},//根据拼音排序的城市数据
				windowTop:0,
				isSearch:false,//是否显示搜索内容，默认：false
				isLetterIndex: 'start',
				isSelectAreaId: 'start',
			};
		},
		onLoad() {
			this.getHotAreaList()
			this.dealwithCityData();
		},
		onShow() {
			//获取手机系统信息
			const systemInfo=uni.getSystemInfoSync();
			console.log("[systemInfo]",systemInfo)
			// #ifdef H5 || APP-PLUS || MP-ALIPAY
			this.windowTop=systemInfo.windowTop
			// #endif
		},
		computed: {
			...mapGetters(["areaCacheList"]),
			cityData() {
				return this.areaCacheList || []
			}
		},
		methods:{
			// 获取热门城市
			getHotAreaList() {
				getHotArea().then(data=> {
					console.log(data)
					console.log('data-热门城市')
				})
			},
			//处理城市数据
			dealwithCityData(){
				let tempCityList={};//临时城市数据
				const cityData=this.cityData || [];
				let cityTempList = []
				cityData.forEach(element=> {
					if (element.children) {
						element.children.forEach(child=> {
							cityTempList.push({
								id: child._id,
								name: child.name
							})
						})
					}
				})
				// //把数据转换成拼音
				let tempPinYinList={};//临时拼音数据
				cityTempList.forEach(temp=>{
					let py=pinyin(temp.name.substring(0,1), { pattern: 'first', toneType: 'none' }).toUpperCase();
					if(tempPinYinList[py]==undefined){
						tempPinYinList[py]=[];
					}
					tempPinYinList[py].push(temp)
				})
				
				//对数据进行排序
				this.cityList= this.objKeySort(tempPinYinList);
			},
			objKeySort(obj) {
				//排序的函数
			    var newkey = Object.keys(obj).sort();
			　　//先用Object内置类的keys方法获取要排序对象的属性名，再利用Array原型上的sort方法对获取的属性名进行排序，newkey是一个数组
			    var newObj = {};//创建一个新的对象，用于存放排好序的键值对
			    for (var i = 0; i < newkey.length; i++) {//遍历newkey数组
			        newObj[newkey[i]] = obj[newkey[i]];//向新创建的对象中按照排好的顺序依次增加键值对
			    }
			    return newObj;//返回排好序的新对象
			},
			
			//点击字母滚动事件
			scrollHandle(index){
				console.log(index)
				console.log('index-----------------------')
				this.isLetterIndex = index
				const query = uni.createSelectorQuery().in(this);
				uni.createSelectorQuery().select("#address").boundingClientRect(data=>{
				　　uni.createSelectorQuery().select("#"+index).boundingClientRect((res)=>{
					
				　　　　uni.pageScrollTo({
				　　　　　　duration:100,
				　　　　　　scrollTop:res.top - data.top - 12,//滚动到实际距离是元素距离顶部的距离减去最外层盒子的滚动距离
				　　　　})
				　　}).exec()
				}).exec();
			},
			//选择城市
			chooseCityHandle(params){
				console.log(params)
				console.log('params00000000000000000')
				this.isSelectAreaId = params.id
			}
			
		}
	}
</script>

<style lang="scss" scoped>
.address-wrap{
	padding: 24rpx;
	display: flex;
	flex-direction: column;
	background: #fff;
	//城市筛选区
	.address-scroll{
		display: flex;
		flex-direction: column;
		.address-currentcity{
			display: flex;
			flex-direction: column;
			.address-currentcity-title{
				font-size: 32rpx;
				font-family: PingFang SC;
				font-weight: 500;
				color: #4F4B4E;
				padding-bottom: 20rpx;
			}
			
			.icon-dingwei {
				width: 24rpx;
				height: 24rpx;
			}
		}
		//选择城市
		.address-choosecity{
			display: flex;
			flex-direction: column;
			.address-choosecity-title{
				font-size: 32rpx;
				font-family: PingFang SC;
				font-weight: 400;
				color: #999999;
			}
			
		}
		
	}
	.address-choosecity-con{
		display: flex;
		flex-direction: column;
		.address-choosecity-item{
			display: flex;
			flex-direction: column;
			.choosecity-item-title{
				font-size: 15px;
				font-family: PingFang SC;
				font-weight: 400;
				color: #4F4B4E;
				padding: 20rpx;
			}
			.choosecity-item-li{
				flex-wrap: wrap;
			}
			
		}
	}
	.choosecity-item-li-item {
		width: 200rpx;
		height: 70rpx;
		background: #fff;
		border-radius: 4rpx;
		border: 1rpx solid #E5E5E5;
		font-size: 26rpx;
		font-family: PingFang SC;
		font-weight: 400;
		color: #858585;
		line-height: 68rpx;
		text-align: center;
		margin-right: 40rpx;
		margin-bottom: 30rpx;
		padding: 0 8rpx;
		&:nth-child(3n) {
			margin-right: 0;
		}
		&.is-active {
			background: rgba(240,133,0,0.1);
			border: 1rpx solid #F08500;
			color: #4F4B4E;
		}
	}
	//字母
	.address-letter{
		position: fixed;
		top: 100rpx;
		right: 2rpx;
		display: flex;
		flex-direction: column;
		z-index: 10;
		font-size: 24rpx;
		font-family: PingFang SC;
		font-weight: bold;
		color: #4F4B4E;
		align-items: center;
		.address-letter-item{
			margin-bottom: 16rpx;
			&.is-active {
				color: #F08500;
			}
		}
		.letter-image {
			width: 24rpx;
			height: 24rpx;
		}
	}
	.search-content{
		display: flex;
		flex-direction: column;
		margin-top: 12px;
		margin-bottom: 12px;
		.search-con-item{
			border-bottom: 1px solid rgba(254, 254, 254, .2);
			height: 35px;
			line-height: 35px;
			font-size: 14px;
			font-family: PingFang SC;
			font-weight: 400;
			color: #4F4B4E;
		}
		.search-total{
			height: 100px;
			display: flex;
			font-size: 14px;
			font-family: PingFang SC;
			font-weight: 400;
			color: #4F4B4E;
			justify-content: center;
			align-items: center;
		}
	}
}
</style>