本文实例讲述了JS实现网页上随滚动条滚动的层效果代码。分享给大家供大家参考,具体如下:
这款网页上随滚动条滚动层代码,拖动滚动条即可看到效果,对联广告的代码也都是基于此的,右侧的浮动层同样是可以关闭的稍微加工,便可实现一个浮动广告的代码,运行一下,先看效果吧。
运行效果截图如下:
在线演示地址如下:
http://demo.phpstudy.net/js/2015/js-web-fixed-scroll-adv-codes/
具体代码如下:
<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"> <html xmlns=\"http://www.w3.org/1999/xhtml\"> <head> <meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /> <title>随滚动条滚动的层</title> <style> body{ margin:0; padding:0; font-size:12px; font-family:\"宋体\",Arial, Helvetica, sans-serif;} div,p,ul,ol,li,dl,dt,dd,h1,h2,h3,h4,h5,h6,form,input,form{ margin:0; padding:0;} h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal;} img{ border:0;} ol,ul{list-style:none;} a{ text-decoration:none; color:#fff;} a:hover{ text-decoration:none;} #scroll_div{ width:100px; height:400px; background:#990; } #btn_close,#btn_gotop{ cursor:pointer;} </style> </head> <body> <div style=\" width:1002px;height:42px;margin:0 auto; background-color:#060;\">头</div> <div style=\"width:1002px; margin:0 auto; background-color:#f60;\"> 我们提供各类编程源码、<br>素材、书籍教程、设计模板、<br>网页特效代码以及常用软件下载等,<br>做有质量的<br>学习型源码下载站。 <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> </div> <div style=\" width:1002px;height:95px;margin:0 auto; background-color:#060;\">底</div> <div id=\"scroll_div\"> <span id=\"btn_close\">关闭</span><br /> <span id=\"btn_gotop\">返回顶部</span> </div> <script type=\"text/javascript\"> var Bianyuan = { //添加事件2(DOM-保证this指向对象是obj) addEvent : function(obj, type, fn){ if (obj.attachEvent){ obj[\'e\'+type+fn] = fn; obj[type+fn] = function(){obj[\'e\'+type+fn](window.event);} obj.attachEvent(\'on\'+type, obj[type+fn]); }else{ obj.addEventListener(type, fn, false); } }, //获取id元素 $ : function(id){ return document.getElementById(id); }, //取得浏览器可视区size getBrowserSize : function(){ var pageWidth = window.innerWidth, pageHeight = window.innerHeight; if (typeof pageWidth != \"number\"){ if (document.compatMode == \"CSS1Compat\"){ pageWidth = document.documentElement.clientWidth; pageHeight = document.documentElement.clientHeight; } else{ pageWidth = document.body.clientWidth; pageWidth = document.body.clientHeight; } } //ie减去17滚动条宽度 if(!window.ActiveXObject){ pageWidth -= 17; } return { width : pageWidth, height : pageHeight } }, //获取滚动条高度 getPageScroll : function(){ var yScroll; if (self.pageYOffset) { yScroll = self.pageYOffset; } else if (document.documentElement && document.documentElement.scrollTop){ yScroll = document.documentElement.scrollTop; } else if (document.body) { yScroll = document.body.scrollTop; } return yScroll; } } function scrollBar(scrollId, dir, headHeight, footHeight, areaWidth, o){ //滚动框宽高 var scrollBar = Bianyuan.$(scrollId), barWidth = scrollBar.offsetWidth, barHeight = scrollBar.offsetHeight; //可视区宽高 var pageWidth = Bianyuan.getBrowserSize().width, pageHeight = Bianyuan.getBrowserSize().height; //内容宽高 var widthMore = document.documentElement.scrollWidth, heightMore = document.body.scrollHeight||(document.documentElement.scrollHeight); //最大宽高 var maxWidth = Math.max(pageWidth, widthMore), maxHeight = Math.max(pageHeight, heightMore); scrollBar.style.position = \'absolute\'; //设置top--假设滚动框高度小于整个页面高度,如果大于直接将其隐藏 if (maxHeight < (barHeight + footHeight + footHeight + 4)){ scrollBar.style.display = \'none\'; }else{ //不挡顶部---如果想改距顶高度,改下边的第一个2值 scrollBar.style.top = Bianyuan.getPageScroll() + headHeight + 2 + \'px\'; //不挡底部 if ((heightMore - Bianyuan.getPageScroll() - barHeight) <= footHeight){ scrollBar.style.top = heightMore - footHeight - barHeight - 2 + \'px\'; } } //无视主体内容-左右 if (dir == \'left\' && areaWidth == 1){ scrollBar.style.left = 2 + \'px\'; }else if (dir == \'right\' && areaWidth == 1){ scrollBar.style.left = maxWidth - barWidth - 2 + \'px\'; //根据主体内容宽-左右 }else if (dir == \'left\' && areaWidth != 1){ if (pageWidth >= (barWidth*2 + areaWidth + 4)){ scrollBar.style.left = (pageWidth - areaWidth)/2 - barWidth - 2 + \'px\'; }else{ scrollBar.style.left = 2 + \'px\'; } }else if (dir == \'right\' && areaWidth != 1){ if (pageWidth >= (barWidth*2 + areaWidth + 4)){ scrollBar.style.left = (pageWidth - areaWidth)/2 + areaWidth + 2 + \'px\'; }else{ scrollBar.style.left = maxWidth - barWidth - 2 + \'px\'; } } //关闭和返回顶部 if (o){ if (o.btnClose){ var closeBtn = Bianyuan.$(o.btnClose); Bianyuan.addEvent(closeBtn, \'click\', function(){ scrollBar.style.display = \'none\'; }) } if (o.goTop){ var gotopBtn = Bianyuan.$(o.goTop); Bianyuan.addEvent(gotopBtn, \'click\', function(){ document.documentElement.scrollTop = 0; document.body.scrollTop = 0; }) } } //改变窗口大小或滚动条滚动 resizeWindow(scrollId, dir, headHeight, footHeight, areaWidth, o); } function resizeWindow(scrollId, dir, headHeight, footHeight, areaWidth, o){ window.onresize = function(){scrollBar(scrollId, dir, headHeight, footHeight, areaWidth, o);} window.onscroll = function(){scrollBar(scrollId, dir, headHeight, footHeight, areaWidth, o);} } </script> <script type=\"text/javascript\"> scrollBar(\"scroll_div\", \"right\", 42, 95, 1002, {btnClose:\"btn_close\",goTop:\"btn_gotop\"}); </script> </body> </html>
希望本文所述对大家JavaScript程序设计有所帮助。
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