JS垂直落体回弹原理

 /*

 *JS垂直落体回弹原理

 */

 <!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>无标题文档</title>

 <style type="text/css">

 #div1{ width:100px; height:100px; position:absolute; background:red;}

 </style>

 <script type="text/javascript">

 window.onload = function(){

     var oBtn = document.getElementById("btn");

     oBtn.onclick = function (){

         startMove("div1",15);

     }

     function startMove(id,n1){

         var oDiv = document.getElementById(id);

         var iSpeed = 0;

         setInterval(function (){

             iSpeed +=n1;

             var t = oDiv.offsetTop + iSpeed;

             document.title = t + " , " + iSpeed;

             console.log(iSpeed);

             if(t > document.documentElement.clientHeight - oDiv.offsetHeight){

                 t = document.documentElement.clientHeight - oDiv.offsetHeight;

                 iSpeed *= -1;

                 iSpeed *=0.75;

             }

             oDiv.style.top = t + "px";

         },30);

     }

 }

 </script>

 </head>

 <body>

 <input type="button" value="运动" id="btn" />

 <div id="div1"></div>

 </body>

 </html>
巴特西

JS垂直落体回弹原理

最新文章

热门文章
