jquery 插件页面回到顶部

 $.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: '', // Text for element
        activeOverlay: false  // Set CSS color to display scrollUp active point, e.g '#00FFFF'
    });

  <a id="scrollUp" href="#top" title="" style="position: fixed; z-index: 2147483647;
        display: block;"></a>

#scrollUp
{
    bottom: 20px;
    right: 20px;
    height: 38px;
    width: 38px;
    background: url("../../../images/top.png") no-repeat;
}