场景

Leaflet快速入门与加载OSM显示地图：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/122290880

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

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: [
                    [
                        [
                            [-105.00432014465332, 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],
                            [-105.00432014465332, 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

"en">


    "UTF-8">
    
    "stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" />
    



    
"map">