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一、背景

最近有小伙伴遇到了大數據量地圖加載慢的情況，觀察iServer性能并未發揮到極致，所以通過搭建子域的方式成功實現了瀏覽速度的提升。
子域能對加載速度進行提升是因為瀏覽器對同一個域名服務的并發請求數量有限制，通過 Nginx 服務部署多個子域名，加大向 iServer 發送數據請求的并發量，從而達到提升加載速度的目的。

二、Nginx配置步驟

1.修改Nginx 配置nginx.conf，監控多個端口

server {
		listen       8881;
		listen       8882;
		listen       8883;
		listen       8884;
		listen       8885;
        server_name  127.0.0.1,172.16.15.124;
        location / {
            root   html;
            index  index.html index.htm;
        }

		location /iserver {
            proxy_pass   http://172.16.15.124:8090;
            proxy_redirect off;
			proxy_buffering off;
			proxy_set_header Host $host:$server_port;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        }

三、前端對接

1.Leaflet使用subdomains參數，url中加入{s}占位符

代碼如下：

var map= "";
    map = L.map('map', {
        crs: L.CRS.EPSG4326,
        center: [0, 0],
        maxZoom: 18,
        zoom: 1
    });
    L.supermap.tiledMapLayer("http://127.0.0.1:{s}/iserver/services/map-world/rest/maps/World",{subdomains:[8881,8882,8883,8884]}).addTo(map);

2.OpenLayer通過設置url參數{?-?}，并通過XYZ方式對接

代碼如下：

 var map, url = "http://127.0.0.1:888{1-4}/iserver/services/map-world/rest/maps/World/zxyTileImage.png?z={z}&x={x}&y={y}";
    map = new ol.Map({
        target: 'map',
        controls: ol.control.defaults({attributionOptions: {collapsed: false}})
            .extend([new ol.supermap.control.Logo()]),
        view: new ol.View({
            center: [0, 0],
            zoom: 2,
            projection: 'EPSG:3857',
            multiWorld: true
        })
    });
    var layer = new ol.layer.Tile({
        source: new ol.source.XYZ({
            url: url,
            wrapX: true
        }),
        projection: 'EPSG:3857'
    });
    map.addLayer(layer);
    map.addControl(new ol.supermap.control.ScaleLine());

3.Classic直接傳遞url數組

代碼如下：

var map, layer,
        host = window.isLocal ? window.server : "https://iserver.supermap.io",
        url = host + "/iserver/services/map-world/rest/maps/World";
    //初始化地圖
    map = new SuperMap.Map("map", {
        controls: [
            new SuperMap.Control.Navigation(),
            new SuperMap.Control.Zoom()]
    });
    map.addControl(new SuperMap.Control.MousePosition());
    //初始化圖層
    layer = new SuperMap.Layer.TiledDynamicRESTLayer("World", ["http://127.0.0.1:8881/iserver/services/map-world/rest/maps/World","http://127.0.0.1:8882/iserver/services/map-world/rest/maps/World","http://127.0.0.1:8883/iserver/services/map-world/rest/maps/World"], null, {maxResolution: "auto"});
    //監聽圖層信息加載完成事件
    layer.events.on({"layerInitialized": addLayer});
    function addLayer() {
        map.addLayer(layer);
        //顯示地圖范圍
        map.setCenter(new SuperMap.LonLat(0, 0), 0);

4.MapboxGL直接傳遞tiles參數

代碼如下：

var host = window.isLocal ? window.server : 'https://iserver.supermap.io';
            var map = new mapboxgl.Map({
                container: 'map', // container id
                style: {
                    version: 8,
                    sources: {
                        'raster-tiles': {
                            type: 'raster',
                            tileSize: 256,
                            tiles: ["http://127.0.0.1:8881/iserver/services/map-world/rest/maps/World","http://127.0.0.1:8882/iserver/services/map-world/rest/maps/World","http://127.0.0.1:8883/iserver/services/map-world/rest/maps/World"],
                            rasterSource: 'iserver'
                        }
                    },

                    layers: [
                        {
                            id: 'simple-tiles',
                            type: 'raster',
                            source: 'raster-tiles',
                            minzoom: 0,
                            maxzoom: 22
                        }
                    ]
                },
                crs: 'EPSG:4326', // 或者 mapboxgl.CRS.EPSG4326  或者 new mapboxgl.CRS('EPSG:4326',[-180,-90,180,90]);
                center: [0, 0],
                zoom: 2
            });