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最近写的一个功能属实把我难倒了,刚开始我请求一次数据获取所有标记点,然后设置到地图上,然后后面根据socket传来的数据对这些标记点实时更新,改变标记点的图片或者文字,
1:第一个想法是直接全量替换,事实证明这样不行,会很卡顿,有明显闪烁感,如果标记点比较少,就十几个可以用这种
2:第二个想法是markerlist数组与socket做判断,找到数据改变的那一个,使用map.removeMarkers接口移除掉旧的那个标记点,然后使用map.addMarkers添加新的标记点,结果还是不行,如果把map.addMarkers的参数clear设置为false,就只移除而不渲染,如果设置为true地图上就只有这一个点,而其他的点全部没了,那我就在想既然无法复用,那这标记点还要id有啥用,终于灵感来了,不需要写移除方法,只需要写添加方法就行,id一样会自动把旧的替换掉,试了一下果然可以,下面是一个简化demo
1:标记点数据
export default [{"id": 1,"latitude": 40.092954,"longitude": 116.245615,"width": 32,"height": 32,"iconPath": "../../static/images/tubiao_4.png","callout": {"content": "1","color": "#fff","fontSize": 14,"borderRadius": 4,"bgColor": "#2B73FF","display": "ALWAYS","padding": 3,"anchorY": 5}},{"id": 2,"latitude": 39.787718,"longitude": 116.44463,"width": 32,"height": 32,"iconPath": "../../static/images/tubiao_4.png","callout": {"content": "2","color": "#fff","fontSize": 14,"borderRadius": 4,"bgColor": "#2B73FF","display": "ALWAYS","padding": 3,"anchorY": 5}},{"id": 3,"latitude": 40.03828,"longitude": 116.406358,"width": 32,"height": 32,"iconPath": "../../static/images/tubiao_4.png","callout": {"content": "3","color": "#fff","fontSize": 14,"borderRadius": 4,"bgColor": "#2B73FF","display": "ALWAYS","padding": 3,"anchorY": 5}},{"id": 4,"latitude": 39.930755,"longitude": 116.248167,"width": 32,"height": 32,"iconPath": "../../static/images/tubiao_4.png","callout": {"content": "4","color": "#fff","fontSize": 14,"borderRadius": 4,"bgColor": "#2B73FF","display": "ALWAYS","padding": 3,"anchorY": 5}},{"id": 5,"latitude": 39.942493,"longitude": 116.610476,"width": 32,"height": 32,"iconPath": "../../static/images/tubiao_4.png","callout": {"content": "5","color": "#fff","fontSize": 14,"borderRadius": 4,"bgColor": "#2B73FF","display": "ALWAYS","padding": 3,"anchorY": 5}}
]2:页面
<template><view><map class="map" id="map" style="width: 750rpx; height: 1300rpx" :include-points="includesPoints"></map></view>
</template><script setup>
import { onLoad, onShow, onReady } from '@dcloudio/uni-app';
import { ref, nextTick, watch } from 'vue';
import markerList from '../../static/js/markerList';
let map = null;
onLoad(() => {map = uni.createMapContext('map');
});
onShow(() => {});
onReady(() => {addMarker();
});
let includesPoints = ref([]);
let markerListArr = ref([]);
let markeraaa = ref([]);
const addMarker = () => {markerListArr.value = markerList;map.addMarkers({markers: markerListArr.value,clear: true,success: function () {console.log('log添加成功');},fail: function () {console.log('err添加失败');}});includesPoints.value = markerListArr.value.map((item) => ({ latitude: item.latitude, longitude: item.longitude }));setTimeout(() => {setMarker();}, 3000);
};
const setMarker = (num) => {// map.removeMarkers({// markerIds: [2],// success(res) {// markerListArr.value.splice(1, 1);// console.log('移除成功-------- item.id:>> ', markerListArr.value);// }// });let obj = {id: 2,latitude: 39.913144,longitude: 116.35788,// latitude: 39.787718,// longitude: 116.44463,width: 32,height: 32,joinCluster: false,checked: true,online: '1',deviceNo: '13302528497',drivingStatus: '2',iconPath: '../../static/images/tubiao_6.png',callout: {content: '20',color: '#fff',fontSize: 14,borderRadius: 4,bgColor: '#2B73FF',display: 'ALWAYS',padding: 3,anchorY: 5}};markerListArr.value.push(obj);map.addMarkers({markers: [obj],clear: false,success(res) {console.log('添加成功-------- item.id:>> ', markerListArr.value);}});
};
</script><style></style>
页面效果
