为页面添加按钮，平滑的滚动到顶部/底部
< Feedback on Add button for Smooth Scroll to the top / bottom
请问怎么改成向上或向下滚动500px请问怎么改成向上或向下滚动500px
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请问怎么改成向上或向下滚动500px
请问怎么改成向上或向下滚动500px