create a 2D map

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<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no"><title>Get started with MapView - Create a 2D map</title><style>  html, body, #viewDiv {    padding: 0;    margin: 0;    height: 100%;    width: 100%;  }</style><link rel="stylesheet" href="https://js.arcgis.com/4.0/esri/css/main.css"><script src="https://js.arcgis.com/4.0/"></script><script>require([  "esri/Map",//为了创建地图需要的类  "esri/views/MapView",//为了能够浏览地图需要的类  "dojo/domReady!"//加载dojo框架以便在执行代码前获得DOM], function(Map, MapView){  var map = new Map({    basemap: "streets"  });  var view = new MapView({    container: "viewDiv",  // Reference to the scene div created in step 5    map: map,  // Reference to the map object created before the scene    zoom: 4,  // Sets the zoom level based on level of detail (LOD)    center: [15, 65]  // Sets the center point of view in lon/lat  });});</script></head><body>  <div id="viewDiv"></div></body></html>

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