效果:当出现滚动条,且滚动条出现移动时,把回到顶端按钮 显示出来:当滚动条回到顶部时,将回到顶端按钮隐藏. <script type="text/javascript"> //获取滚动条的位置 function getScrollTop() { var scrollPos; if (window.pageYOffset) { scrollPos = window.pageYOffset; } else if (document.compatMode && d
1.封装方法: var textareaListener = { /*事件监听器兼容 * *attachEvent——兼容:IE7.IE8:不兼容firefox.chrome.IE9.IE10.IE11.safari.opera *addEventListener——兼容:firefox.chrome.IE.safari.opera:不兼容IE7.IE8 * */ compatibleEvtListener: function () { var observe; if (window.attac
var scrollFunc = function (e) { e = e || window.event; var t = document.documentElement.scrollTop || document.body.scrollTop; //变量t就是滚动条滚动 if (t <=100) { $(".top-header").attr('style','background:transport'); }else{ $(".top-header&q