交集和并集的运算 功能实现： 通过输入集合A和集合B的元素，输出A与B的交集，输出A与B的并集。 从而达到目的-Intersection and union computing function realization: by entering the set A and set B elements, the output of the intersection of A and B, the output A and B, and Set. So as to achieve th