openlayers学习一
作者:互联网
openlayers是开源webgis,
先去官网下载 OpenLayers - Get the Code
新建html,写入如下代码:
<head> <script src = "../build/ol.js"></script> </head> <body> <div id="map" class="map"></div> <script> var map = new ol.Map({ layers: [ new ol.layer.Vector({ //这是一个能选择的地图源 source: new ol.source.Vector({ url: 'geojson/countries.geojson', projection: 'EPSG:3857', format: new ol.format.GeoJSON() }) }) ], target: 'map', view: new ol.View({ center: [0, 0], zoom: 2 }) }); </script> </body>
这里先加入ol.js,建立ol.Map类,三要素,layers,target,view
ol.layers.Vector为矢量图层,这里有个坑,
会报错:from origin null has been blocked by cors policy: cross origin requests are only supported for protocol schemes:
需要做处理 在chrome浏览器快捷方式, 点击右键属性,快捷方式目标填入
-allow-file-access-from-files
然后,就行了
标签:layers,origin,ol,学习,Vector,openlayers,new,快捷方式 来源: https://www.cnblogs.com/fkess/p/15806809.html