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Add button for Smooth Scroll to the top / bottom

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

Review: Good - script works

huoyankakaxi
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Posted: 10-11-2015
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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

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