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我想添加图形可视化到我的PHP页面，并为此编写了代码，但我不知道它为什么没有显示任何内容。任何人都可以帮我解决我的问题吗？图形可视化ArborJS
在此先感谢
<html>
<head>
<script language="javascript" type="text/javascript" src="arbor_files/jquery.js"> </script>
<script language="javascript" type="text/javascript" src="arbor_files/arbor.js"></script>
<script language="javascript" type="text/javascript" src="arbor_files/arbor-tween.js"></script>
<script language="javascript" type="text/javascript" src="arbor_files/graphics.js"></script>
<script language="javascript" type="text/javascript" src="arbor_files/renderer.js"></script>
</head>
<body>
<canvas id="viewport" width="800" height="600"></canvas>
<script language="javascript" type="text/javascript">
var sys = arbor.ParticleSystem(1000, 400,1);
sys.parameters({gravity:true});
sys.renderer = Renderer("#viewport") ;
var animals = sys.addNode('Animals',{'color':'red','shape':'dot','label':'Animals'});
var dog = sys.addNode('dog',{'color':'green','shape':'dot','label':'dog'});
var cat = sys.addNode('cat',{'color':'blue','shape':'dot','label':'cat'});
sys.addEdge(animals, dog);
sys.addEdge(animals, cat);
</script>
</body>
</html>
