2020年中国人均gdp排名:JAVA小程序的问题,大家看一下啊!

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这段代码是图片向上滚动且有停顿的效果,但是我插到我的页面里发生了变化,刚开始滚动的位置对的了,时间越长,位置偏离越厉害,本来是在每行图片的下栏停顿一下,循环时间长了就到了图片中间停顿了,位置不准确,怎么回事啊,