ScrollUp 是一个轻量级的 jQuery 插件，轻松实现了滚动页面的 “返回顶部” 的功能。

在线演示：http://markgoodyear.com/labs/scrollup/

示例代码：

$(function () {
    $.scrollUp({
        scrollName: 'scrollUp', // Element ID
        topDistance: '300', // Distance from top before showing element (px)
        topSpeed: 300, // Speed back to top (ms)
        animation: 'fade', // Fade, slide, none
        animationInSpeed: 200, // Animation in speed (ms)
        animationOutSpeed: 200, // Animation out speed (ms)
        scrollText: 'Scroll to top', // Text for element
        activeOverlay: false, // Set CSS color to display scrollUp active point, e.g '#00FFFF'
    });

});

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