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设置了2个随机数变量。第一个随机数是点了按钮之后出现的，第二随机数是根据前一个的随机结果，进行事件分支，然后第二个随机数就停不下来了，一直不停的随机，设置的文字也会不停变化。
预览页面，会一直不停的随机
