如果是个正方体，先获取面，再进行面积计算
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/three.js"></script>
<script type="text/javascript">
var Geometry = new THREE.BoxGeometry(100, 50, 10);
var face0 = Geometry.faces[0];
var verts = Geometry.vertices;
var tri = new THREE.Triangle(verts[face0.a], verts[face0.b], verts[face0.c]);
var area = tri.getArea()*2;
alert(area+"平米");
</script>
</head>
<body>
</body>
</html>
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