69. var family = [];
!
var child = {
age: 10
container: family
};
!
var parent = {
child: child,
container: family
};
!
family.push(child);
family.push(parent);
70. var grandparent = {
child: parent,
container: family
};
!
family.push(parent);
雪だるま式に増えるメモリ