JavaScript数组是否可以包含自身？

Question

In Ruby, it's possible for an array to contain itself , making it a recursive array. Is it possible to put a JavaScript array inside itself as well?

var arr = new Array();
arr[0] = "The next element of this array is the array itself."

Now how can I move arr into arr[1] so that the array contains itself recursively, (eg, so that arr[1] is arr , arr[1][1] contains arr , arr[1][1][1] contains arr , etc.)?

Answer 1

Sure:

var a = [1];
a.push(a);

They're the same object:

a[1] === a[1][1]  // true

And a convincing screenshot:

Answer 2

Yes, sure:

var x = [];
x.push(x);
console.log(x[0] === x); // true