下面这段代码调用arcgis API for JavaScript地图怎么不显示，只有个框？



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<title>map</title>

<link rel="stylesheet" type="text/css"

href="http://localhost/arcgis_js_api ... gt%3B

<link rel="stylesheet" type="text/css"

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href="http://localhost/arcgis_js_api ... ot%3B />

<script type="text/javascript"

src="http://localhost/arcgis_js_api ... gt%3B

<script src="dojo/jsapi_vsdoc10_v33.js" type="text/javascript"></script>

<style type="text/css">

.MapClass

{ width:900px;

height:600px;

border:1px solid #000;

}

</style>

<script type="text/javascript">

dojo.require("esri.map");

dojo.addOnLoad(function ()

{

var MyMap = new esri.Map("MyMapDiv");

var MyTiledMapServiceLayer = new esri.layers.ArcGISTiledMapServiceLayer

("http://www.arcgisonline.cn/Arc ... 6quot;);

MyMap.addLayer(MyTiledMapServiceLayer)

}

)

</script>

</head>

<body class="tundra"></body>

</html>