openlayers加載WMS服務圖層

var tian_di_tu_road_layer = new ol.layer.Tile({ title: "天地圖路網", source: new ol.source.XYZ({ url: "http://t4.tianditu.com/DataServer?T=vec_w&x={x}&y={y}&l={z}&tk=42dca576db0

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