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就是比较距离如何做相应动作，在哪里有这个条件呢，当两个图片之间距离小于多少的时候的这种条件
例如图片A和B的对象名分别叫图A和图B，那系统条件-比较两值，distance(图A.x,图A.y,图B.x,图B.y) 小于 你想要的值即可。