wordpress不显示网站标题,外贸网站为何搜不到,双语网站模板下载,长沙市网站推广多少钱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…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
templateviewmap classmap idmap stylewidth: 750rpx; height: 1300rpx :include-pointsincludesPoints/map/view
/templatescript 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);}});
};
/scriptstyle/style页面效果
