官方api:
https://js.arcgis.com/3.27/dijit/themes/claro/claro.css (常用)
https://js.arcgis.com/3.27/dijit/themes/tundra/tundra.css (常用)
https://js.arcgis.com/3.27/dijit/themes/nihilo/nihilo.css
https://js.arcgis.com/3.27/dijit/themes/soria/soria.css
使用方法类似这样：
<link rel="stylesheet" href="https://js.arcgis.com/3.27/dijit/themes/claro/claro.css"> <body class="claro"> <div id="map"></div> </body>