后端返回的数据

我们要得效果

<template>
	<view>
		<view v-for="(value,key) in cities" :key="key">
			<view style="color: red;"> {{ key }} </view>
			 <view style="border: 1rpx solid black;">
				<text v-for="item in value" style="margin-right: 15rpx;"> {{ item }} </text>
			 </view>
		</view>
	</view>
</template>

<script>
	import { citysApi } from '@/api/city.api.js'
	export default {
		data() {
			return {
				cities: {}
			}
		},
		methods: {
		},
		async onLoad() {
			const res = await citysApi()
			let obj = {}
		
			for(let i = 65; i <= 90; i++) {
				let key = String.fromCharCode(i)
				obj[key] = []
			}
			res.data.forEach(item => {
				let key = item.city_pre.toLocaleUpperCase()
				obj[key].push(item.city_name)
			})
			// 把长度为0的项，删除掉
			Object.keys(obj).forEach(key => {
				if(obj[key].length === 0)  delete obj[key]
			})
			this.cities = obj
		}
	}
</script>

<style>

</style>