仿淘宝网返右下角回顶部按钮效果，只有超过屏幕高度之后才会弹出，用户体验良好，兼容当前主流浏览器。
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<a href="https://www.wuming.ren">武鸣人</a>，各种信息资源免费发布，分享励志语录经典短句，减肥健身常识，各种js特效代码。网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)<hr>
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