场景
Leaflet快速入门与加载OSM显示地图：
Leaflet快速入门与加载OSM显示地图_BADAO_LIUMANG_QIZHI的博客-CSDN博客
在上面的基础上，怎样使用插件实现地图加载等待效果如下
注：
博客：
BADAO_LIUMANG_QIZHI的博客_霸道流氓气质_CSDN博客-C#,SpringBoot,架构之路领域博主
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实现
1、插件地址
GitHub - makinacorpus/Leaflet.Spin: Show a spinner on the map using Spin.js
2、下载源码，引入插件所需要的spin.js和leaflet.spin.min.js
3、添加地图区域GeoJson数据
var campus = {type: "Feature",properties: {popupContent: "This is the Auraria West Campus",style: {weight: 2,color: "#999",opacity: 1,fillColor: "#B0DE5C",fillOpacity: .8}},geometry: {type: "MultiPolygon",coordinates: [[[[-105.0043465332, 39.74732195489861],[-105.00715255737305, 39.7462000683517],[-105.00921249389647, 39.74468219277038],[-105.01067161560059, 39.74362625960105],[-105.01195907592773, 39.74290029616054],[-105.00989913940431, 39.74078835902781],[-105.00758171081543, 39.74059036160317],[-105.00346183776855, 39.74059036160317],[-105.00097274780272, 39.74059036160317],[-105.00062942504881, 39.74072235994946],[-105.00020027160645, 39.74191033368865],[-105.0007152557373, 39.74276830198601],[-105.00097274780272, 39.74369225589818],[-105.00097274780272, 39.74461619742136],[-105.00123023986816, 39.74534214278395],[-105.00183105468751, 39.74613407445653],[-105.0043465332, 39.74732195489861]],[[-105.00361204147337, 39.74354376414072],[-105.00301122665405, 39.74278480127163],[-105.00221729278564, 39.74316428375108],[-105.00283956527711, 39.74390674342741],[-105.00361204147337, 39.74354376414072]]],[[[-105.00942707061768, 39.73989736613708],[-105.00942707061768, 39.73910536278566],[-105.00685214996338, 39.73923736397631],[-105.00384807586671, 39.73910536278566],[-105.00174522399902, 39.73903936209552],[-105.00041484832764, 39.73910536278566],[-105.00041484832764, 39.73979836621592],[-105.00535011291504, 39.73986436617916],[-105.00942707061768, 39.73989736613708]]]]}};
4、模拟ajax请求后台数据，这里是5秒，map.spin(true)则显示加载效果，为false则不显示加载效果
var layer = L.geoJson().addTo(map);//设置为true则显示加载效果map.spin(true);// Simulate AJAX//模拟ajax请求数据，5秒返回数据setTimeout(function () {layer.addData(campus);//设置为false则不显示加载效果map.spin(false);}, 5000);
5、完整示例代码
<!doctype html><html lang="en"><head><meta charset="UTF-8"><title>leaflet实现地图加载等待效果</title><link rel="stylesheet" href="/leaflet@1.7.1/dist/leaflet.css" /><style>html,body,#map {padding: 0;margin: 0;width: 100%;height: 100%;overflow: hidden;}</style></head><body><div id="map"></div><script type="text/javascript" src="/leaflet@1.7.1/dist/leaflet.js"></script><script type="text/javascript" src="./js/spin.js"></script><script type="text/javascript" src="./js/leaflet.spin.min.js"></script><script type="text/javascript">var map = L.map('map').setView([39.743855, -104.998158], 13);L.tileLayer('https://{s}./{z}/{x}/{y}.png', {attribution: ''}).addTo(map);var campus = {type: "Feature",properties: {popupContent: "This is the Auraria West Campus",style: {weight: 2,color: "#999",opacity: 1,fillColor: "#B0DE5C",fillOpacity: .8}},geometry: {type: "MultiPolygon",coordinates: [[[[-105.0043465332, 39.74732195489861],[-105.00715255737305, 39.7462000683517],[-105.00921249389647, 39.74468219277038],[-105.01067161560059, 39.74362625960105],[-105.01195907592773, 39.74290029616054],[-105.00989913940431, 39.74078835902781],[-105.00758171081543, 39.74059036160317],[-105.00346183776855, 39.74059036160317],[-105.00097274780272, 39.74059036160317],[-105.00062942504881, 39.74072235994946],[-105.00020027160645, 39.74191033368865],[-105.0007152557373, 39.74276830198601],[-105.00097274780272, 39.74369225589818],[-105.00097274780272, 39.74461619742136],[-105.00123023986816, 39.74534214278395],[-105.00183105468751, 39.74613407445653],[-105.0043465332, 39.74732195489861]],[[-105.00361204147337, 39.74354376414072],[-105.00301122665405, 39.74278480127163],[-105.00221729278564, 39.74316428375108],[-105.00283956527711, 39.74390674342741],[-105.00361204147337, 39.74354376414072]]],[[[-105.00942707061768, 39.73989736613708],[-105.00942707061768, 39.73910536278566],[-105.00685214996338, 39.73923736397631],[-105.00384807586671, 39.73910536278566],[-105.00174522399902, 39.73903936209552],[-105.00041484832764, 39.73910536278566],[-105.00041484832764, 39.73979836621592],[-105.00535011291504, 39.73986436617916],[-105.00942707061768, 39.73989736613708]]]]}};var layer = L.geoJson().addTo(map);//设置为true则显示加载效果map.spin(true);// Simulate AJAX//模拟ajax请求数据，5秒返回数据setTimeout(function () {layer.addData(campus);//设置为false则不显示加载效果map.spin(false);}, 5000);</script></body></html>
