javascript - ol3Cesium map not loading, giving error ''olcs is not defined" -

i unable load ol3cesium map in ionic 2.

my index.html (code within body tag):

         <ion-app></ion-app>           <script src="http://openlayers.org/en/v3.16.0/build/ol.js"            <script src="../ol3-cesium-v1.17/ol3cesium.js"></script>          <script src="../ol3-cesium-v1.17/cesium/cesium.js"></script> 

my home.ts:

inside constructor, below code added --

        var view = new ol.view({             projection: 'epsg:4326',             center: [-100, 35],             zoom: 3         });          var layer = new ol.layer.tile({             source: new ol.source.tilewms({                 url: 'http://demo.boundlessgeo.com/geoserver/wms',                 params: {                     'layers': 'ne:ne1_hr_lc_sr_w_dr'                 }             })         });         var overlay = new ol.layer.tile({             opacity: 0.7,             extent: [-124.74, 24.96, -66.96, 49.38],             source: new ol.source.tilewms(/** @type {olx.source.tilewmsoptions} */({                 url: 'http://demo.boundlessgeo.com/geoserver/wms',                 params: { 'layers': 'topp:states', 'tiled': true },                 servertype: 'geoserver',                 crossorigin: 'anonymous'             }))         });          var ol2d = new ol.map({             layers: [layer, overlay],             target: 'map2d',             view: view         });          var ol3d = new olcs.olcesium({ map: ol2d });         var scene = ol3d.getcesiumscene();         var terrainprovider = new cesium.cesiumterrainprovider({             url: '//assets.agi.com/stk-terrain/world'         });         ol3d.getcesiumscene().scene.terrainprovider = terrainprovider;          ol3d.setenabled(true);      }); 

'map2d' div id in home.html.

i don't know why saying 'olcs not defined' when running project ionic serve --lab. how can resolve javascript issue?

i solved it. had put cesium.js , ol3cesium inside www folder.