使用产品：iserver ，3Di for Webgl 操作系统：win10 x64
数据类型： oracle 11g x64 或 文件型
问题详细描述：刚开始上手开发，在加载三维地球时，打开后显示黑屏，跟着教学步骤来的，进行了修改。
问题重现步骤： 1.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
<title>getting started</title>
<link href="./Build/SuperMap3D/Widgets/widgets.css" rel="stylesheet">
<link href="./css/pretty.css" rel="stylesheet">
<script src="./js/jquery.min.js"></script>
<script src="./js/config.js"></script>
<script type="text/javascript" src="./Build/SuperMap3D/SuperMap3D.js"></script>
</head>
<body>
<div id="Container"></div>
<div id='loadingbar' class="spinner">
<div class="spinner-container container1">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container2">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container3">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
</div>
<script type="text/javascript">
function onload(SuperMap3D) {
// 通过config.js中的getEngineType,获取引擎类型（EngineType）用于设置启动方式
var EngineType = getEngineType();
var viewer = new SuperMap3D.Viewer('Container', {
contextOptions: {
contextType: Number(EngineType), // Webgl2:2 ; WebGPU:3
}
});
viewer.scenePromise.then(function (scene) {
init(SuperMap3D, scene, viewer);
});
}
</script>
</body>
</html>
2.打开后显示黑屏，中间一直再加载转圈圈3.按照b站教学视频来的2.2 SuperMap iClient3D for WebGL数据加载_哔哩哔哩_bilibili
