this.$http.get('/static/city.json').then(response => {/* 要进行的数据处理 */}） // '/static/city.json'自己要引入的文件或接口。

 getFirstLetter: function (str) { // 得到城市第一个字的首字母
  return pinyin(str)[0][0].charAt(0).toUpperCase()
 },
 buildLetter: function () { // 构建字母项
  letter = []
  for (let i = 0; i < 26; i++) {
   let obj = {}
   obj.letter = String.fromCharCode((65 + i))
   obj.citylist = []
   letter.push(obj)
  }
  },
 buildItem: function (cityNamesFilter) { // 构建城市
  this.buildLetter()
  let _this = this
  for (let i = 0; i < 26; i++) {
   letter[i].citylist = []
  }
  for (let i = 0; i < cityNamesFilter.length; i++) {
   let _index = Number(_this.getFirstLetter(cityNamesFilter[i]).charCodeAt() - 65)
   if (_index >= 0 && _index < 26) {
   letter[_index].citylist.push(cityNamesFilter[i])
   }
  }
  // 如果letter中citylist中没有值的话，过滤这一项
  showCity = showCityTemp = letter.filter(function (value) {
   let len = value.citylist.length
   return len > 0
  })
  },
<template>
 <div id="city">
 <header-item message="城市列表" backUrl="/"></header-item>
 <div class="search-city"><input type="text" placeholder="请输入要搜索的城市" v-model="citySearch" :value="citySearch"></div>
 <div>
  <div id="showCityContent"></div>
  <div v-for="item in showCity" class="letter-item">
  <div><a :id="item.letter">{{item.letter}}</a></div>
  <div v-for="i in item.citylist">{{i}} </div>
  </div>
 </div>
 <aside class="letter-aside">
  <ul>
  <li v-for="item in showCity" @click="naver(item.letter)">{{item.letter}} </li>
  </ul>
 </aside>
 <div id="tip">
  {{tipString}}
 </div>
 </div>
</template>

naver: function (id) { // 点击右边字母滚动
  this.tipString = id
  let obj = document.getElementById(id)
  let tip = document.getElementById('tip')
  tip.setAttribute('class', 'tipAppear')
  setTimeout(function () {
   tip.removeAttribute('class')
  }, 500)
  let oPos = obj.offsetTop
  return window.scrollTo(0, oPos - 36)
  },

watch: {
  citySearch: function (newCitySearch) { //citySearch是input中输入的值
  this.cityFilter(newCitySearch)
  }
 cityFilter: function (city) { // 城市搜索筛选
  let showCityListTemp
  this.buildItem(cityNamesFilter)
  showCity = showCityTemp
  showCity = showCity.filter(function (value) {
   showCityList = value.citylist
   showCityListTemp = showCityList.filter(function (val) {
   return (val.indexOf(city) > -1)
   })
   value.citylist = showCityListTemp
   return value.citylist.length > 0
  })
  this.showCity = showCity
  if (showCity.length === 0) {
   let _showCityContent = document.getElementById('showCityContent')
   _showCityContent.innerText = '查询不到结果'
   _showCityContent.setAttribute('class', 'tipShow')
  } else {
   document.getElementById('showCityContent').innerText = ''
  }
  }