将接口返回的经纬集合点在高德地图上标记展示,
如果实时刷新地图标记点,不加优化,则会造成过多的带宽消耗
所以,地图只需加载一次,局部更新标记点就好了
代码:
<template> <section class="map_warpper"> <div id="container" class="map"></div> </section> </template> <script> import redMarker from '@/assets/img/marker-red.png' import locationMarker from '@/assets/img/marker-location.png' export default { name: 'mapContainer', data () { return {
// 动态的经纬度点集合 locationArray: [], markers: [], cluster: [], map: null,
// 地图中心点 regionLocation: [], zoom: 0 } }, mounted () { this.initMap() }, methods: {// 实例化地图 initMap () { this.regionLocation = util.cookies.get('regionLocation').split(',') const AMap = window.AMap this.map = new AMap.Map('container', { resizeEnable: true, center: this.regionLocation, zoom: 12 })
this.setMarker() }, // 设置点标记 setMarker () { this.markers = [] const AMap = window.AMap // 标记样式 for (const i in this.locationArray) { const position = this.locationArray[i].split(',') this.markers.push(new AMap.Marker({ position: position, content: '<img src=' + locationMarker + '>', offset: new AMap.Pixel(-15, -15) })) } // 聚合点样式 let sts = [{ url: redMarker, size: new AMap.Size(64, 64), offset: new AMap.Pixel(-32, -32) }] // 点聚合 this.cluster = new AMap.MarkerClusterer(this.map, this.markers, { styles: sts, gridSize: 80 }) // 自适应展示所有标记点 this.map.setFitView(this.markers) this.zoom = this.map.getZoom() } } } </script> <style> .map { 100%; height: 100%; } .map_warpper { 100%; height: 800px; } </style>
上面代码解决了两个bug:
1.每次执行setMarker()时,都会this.markers = [],
这一步清除标记点,驱动地图标记刷新,然而并未刷新,新旧点并存,随着叠加,点会越来越多,
这时记得queryLocation()调用前强行删除点 this.cluster.Ra = []
2.然而集合点更新了,但视图依旧未触发更新,这时就需要缩放地图来触发更新,
this.map.getZoom()获取当前缩放级别,然后通过 this.map.setZoom()设置缩放,视图达到刷新,问题解决