Webgl realtime play:

https://alexbeutel.com/webgl/voronoi.html

数组 or 对象？

嵌套数组：用双 [ ]

let poly = [ [1, 2], [2, 3] ];

可以用 poly[i][j] 访问

对象Object：用{ }

let poly = {
point1: [1, 2],
point2: [2, 3]
};
console.log(poly.point1); // [1, 2]
console.log(poly.point1[0]); // 1

可以用 poly["A"][0] || poly.point1访问