（P1.1和P1.2设为输入）这个电路该怎么理解呢？没按下按钮时，P1.1和P1.2的值是1还是0呢，此时P1.1和P1.2悬空，没有接高电平；按下后接地，应该是低电平，值应该是0吧。
但是我在调试的时候却发现，没按下时是0，按下后成1。
能说说为什么吗？还是说要设置内部的上拉或者下拉电阻。
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