JavaScript学习笔记-随滚轮匀速滑动的浮动广告窗动画

时间：2020-12-23 10:46:07
 <!DOCTYPE html>

 <html lang="en" xmlns="http://www.w3.org/1999/xhtml">

 <head>

     <meta charset="utf-8" />

     <title></title>

     <style type="text/css">

         * { padding: 0; margin: 0; border: 0; }

         .adv { position: relative; width: 150px; height: 300px; z-index: 1; top: 120px; left: 20px; }

         .con, .close1 { position: absolute; }

         .con { width: 150px; height: 300px; top: 0; left: 0; background-color: #7ca1ee; }

         .close1 { width: 23px; height: 23px; font-size: 22px; text-align: center; color: #ffffff; top: 5px; left: 120px; z-index: 999; }

             .close1:hover { background-color: #808080; }

         .text { height: 20000px; width: 200000px; margin: 0 auto; }

     </style>

 </head>

 <body>

     <div class="adv" id="advC">

         <div class="con"></div>

         <div class="close1" onclick="clo()">×</div>

     </div>

     <div class="text"> 唯一的缺点就是横向滑动效果不好，建议还是用固定式，不需要滑动比较好 </div>

     <script type="text/javascript">

         var adv = document.getElementById("advC");//获取广告窗口

         function clo() {//关闭广告窗口函数

             adv.style.display = "none";

         }

         var uu = null;//计时器全局变量声明

         function scol() {

             clearInterval(uu);//清除计时器

             //获取广告即将随滚动条滑动到的坐标

             var advTopX = 120 + parseInt(document.body.scrollTop);

             var advLeftX = 20 + parseInt(document.body.scrollLeft);

             var advTop, advLeft;//获取广告当前坐标

             if (adv.currentStyle) {

                 advTop = parseInt(adv.currentStyle.top);

                 advLeft = parseInt(adv.currentStyle.left);

             } else {

                 advTop = parseInt(document.defaultView.getComputedStyle(adv, null).top);

                 advLeft = parseInt(document.defaultView.getComputedStyle(adv, null).left);

             }

             //计算从当前坐标 到 即将滑动到的坐标 需要跑多少距离

             var TopLong = advTopX - advTop;

             var LeftLong = advLeftX - advLeft;

             //利用计时器实现广告匀速随滚动条滑动效果

             uu = setInterval(function () {

                 if ((advTop - 10 < advTopX && advTop + 10 > advTopX) && (advLeft - 10 < advLeftX && advLeft + 10 > advLeftX)) {//判断垂直与横向是否处于该区间值，前后误差10px

                     adv.style.top = advTopX + "px";//垂直距离=即将滑动到的距离

                     adv.style.left = advLeftX + "px";//横向距离=即将滑动到的距离

                     clearInterval(uu);//清除计时器，即到这里的时候就跳出计时器，固定广告位置

                 } else {

                     advTop += parseFloat(TopLong / 200);//将需要滑动的距离平均分为200份

                     adv.style.top = Math.ceil(advTop) + "px";//每次计时器进来滑动1份

                     advLeft += parseFloat(LeftLong / 200);//将需要滑动的距离平均分为200份

                     adv.style.left = Math.ceil(advLeft) + "px";//每次计时器进来滑动1份

                     //这里的份数可以调节滑动速度的快慢，但是必须为整十整百整千，数字越大越慢，越小越快

                 }

             }, 1);

         }

         window.onscroll = scol;//注册滚轮滑动事件

     </script>

 </body>

 </html>

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