AMap.PlaceSearch //地点搜索服务插件，提供某一特定地区的位置查询服务

searchNearBy(keyword:String,center:LngLat,radius:Number,
callback:function(status:String,result:info/SearchResult))
 
// 根据中心点经纬度、半径以及关键字进行周边查询
radius取值范围：0-50000

searchData: function (callback) {
  let keyWords = ['地铁线路', '大型购物广场', '三甲医院', '学校'] // 自选关键词
  let distance = [1000, 3000, 3000, 3000]
  // …………………………………………………………周边分类…………………………………………………………………………………………………………
  placeSearchOptions = { // 构造地点查询类
  pageSize: 10,
  pageIndex: 1,
  city: '021', // 城市
  map: map,
  visible: false
  }
  AMap.service('AMap.PlaceSearch', function () {
  map.clearMap() // 清除地图覆盖物
  placeSearch = new AMap.PlaceSearch(placeSearchOptions)
  for (let i = 0; i < keyWords.length; i++) {
   placeSearch.searchNearBy(keyWords[i], [121.44343879031237, 31.207570983863118], distance[i], callback)
  }
  })
  return callback
 },

 /* 注册每项的点击事件,默认显示num0，也就是交通，实际上所有的数据已经请求到了，点击按钮只是用来切换maker */
  clickItem: function (index, buttons) {
  map.clearMap() // 清除地图覆盖物
  buttons.forEach(function (e, index) {
   e.isActive = false
  })
  buttons[index].isActive = true
  self.listCount = self.num[index].length
  self.listText = self.num[index]
  function onClick (e) {
   console.log(e)
  }
  for (let i = 0; i < self.num[index].length; i++) {
   marker = new AMap.Marker({
//   content: 'div',
   title: 'abc',
   icon: 'https://webapi.amap.com/theme/v1.3/markers/n/mark_b' + (i + 1) + '.png',
   position: [self.num[index][i].location.lng, self.num[index][i].location.lat],
   offset: new AMap.Pixel(-24, 5),
   zIndex: 1,
   map: map,
   clickable: true
   })
   AMap.event.addListener(marker, 'click', onClick)
  }
  return marker
  }