ruby数组拷贝小问题

值拷贝实例：
>> a=[1,2]
=> [1, 2]
>> b=Array.new(a)
=> [1, 2]
>> b.delete(1)
=> 1
>> b
=> [2]
>> a
=> [1, 2]

指针拷贝实例：
>> a=[1,2]
=> [1, 2]
>> b=a
=> [1, 2]
>> b.delete(1)
=> 1
>> b
=> [2]
>> a
=> [2]


ruby中数组用=号赋值是指针拷贝，需要注意一下，而不是像c或其他语言一样=默认是值拷贝。