我需要在 js 中创建一个字典，其键是二维的整数数组，比如这种：
D = {};
var p1 = [0, 0];
var p2 = [1, 2];
D[p1] = 1;
D[p2] = 2;
但是这样创建字典以后，我发现如果想取出某个键对应的值的话，比如
var val = D[p1];
这时 val 的值是 undefined. 想请教大家，如何能够让二维的整数数组能够成为字典的键值？
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