此示例主要是介绍通过默认的实例化方式来添加一个OpenStreetMap图层，如下图所示：
具体实现方式如下：
1 实现此功能的主要组件是“esri/layers/OpenStreetMapLayer”，所以在开始时要引入相关的组件，如下：
require([
"esri/map",
"esri/layers/OpenStreetMapLayer",
"dojo/domReady!"
], function (Map, OpenStreetMapLayer){
});2 然后实例化一个空白底图，空白底图的意思就是我们在实例化Map时只指定初始化中心和初始化级别，其余的底图之类等都不指定，如下：
map = new Map("esri-map-container", {
center: [104.072331,30.66303],
zoom: 11
});3 然后实例化一个OpenStreetMap，将其添加到底图上面，如下所示：
openStreetMapLayer = new OpenStreetMapLayer();
map.addLayer(openStreetMapLayer);4 至此呢，我们就完成了将OSM的图层加载到了ArcGIS的底图上面。完整的代码如下所示：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" />
<title>OpenStreetMap</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.25/esri/css/esri.css">
<style>
html, body, #esri-map-container {
padding: 0px;
margin: 0px;
height: 100%;
}
</style>
<script src="https://js.arcgis.com/3.25/"></script>
<script>
require([
"esri/map",
"esri/layers/OpenStreetMapLayer",
"dojo/domReady!"
], function (Map, OpenStreetMapLayer){
var map, openStreetMapLayer;
map = new Map("esri-map-container", {
center: [104.072331,30.66303],
zoom: 11
});
openStreetMapLayer = new OpenStreetMapLayer();
map.addLayer(openStreetMapLayer);
});
</script>
</head>
<body>
<div id="esri-map-container"></div>
</body>
</html>