Comments (2)
[4, 3, 2, 1]
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有两个数组对象[1, 2, 3],[1, 2, 3, 4],
a = b, 将变量a指向[1, 2, 3, 4], b也指向这一个数组,
a.reverse()操作堆内存中的数组,输出b的时候变化也会显现出来。
[1, 2, 3]如果没有其他引用的话,垃圾回收会清掉它。
from fedexercises.
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