jQuery模拟物体自由落体运动(附演示与demo源码下载)

2019-11-20 10:45:23

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本文实例讲述了jQuery模拟物体自由落体运动的方法。分享给大家供大家参考，具体如下：

运行效果截图如下：

点击此处查看在线演示效果。

完整实例代码点击此处本站下载。

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> <title>自由落体</title> <script src="jquery-1.7.1.min.js" type="text/javascript"></script> <script type="text/javascript" >  $(document).ready(function () {  });  var all_Height = 500;  var a = 9.8; // 加速度  var v = 0;  var prev_Time = 0;  var prev_Speed = 0;  var prev_Height = 0;  var speed = 0;  // 获取当前的高度  var getHeight = function (obj) {   return obj.offset().top;  }  // 获取当前的速度  var getSpeed = function (time, a) {   return time * a;  }  // 向下走时获得当前物体所走的路径  var getCurrentHeight = function (time) {   return 1 / 2 * a * time * time;  }  // 向上走时获得当前物体所走的路径  var getCurrentHeight2 = function (speed, time) {   return speed * time - 1 / 2 * a * time * time;  }  // 向下跑  function down() {   prev_Time = 0;   var interval = setInterval(function () {    if (getHeight($(".obj")) < all_Height) {     prev_Time = prev_Time + 0.1;     var height = getCurrentHeight(prev_Time) + prev_Height;     $(".obj").css("top", height + "px");     $(".info").append("<div>" + height + "</div>");    } else {     speed = getSpeed(a, prev_Time);     prev_Speed = speed;     clearInterval(interval);     up();    }   }, 5);  }  // 向上跑  function up() {   prev_Time = 0;   prev_Speed -= 4; // 动能损耗   var interval = setInterval(function () {    if (speed > 0) {     speed = prev_Speed - getSpeed(a, prev_Time);     prev_Time = prev_Time + 0.1;     var height = all_Height - getCurrentHeight2(prev_Speed, prev_Time);     $(".obj").css("top", height + "px");    } else {     clearInterval(interval);     prev_Height = $(".obj").offset().top;     if (prev_Height < all_Height) {      down();     }    }   }, 5);  }  function play() {   alert('play');   down();   document.getElementById("obj").onclick = null;  } </script> <style type="text/css"> body{ margin:0 0 0 0 ; background:#FFFFFF;} .title { text-align:center; color:#666666; border-bottom:2px solid gray; font-size:30px; line-height:100px; font-weight:bolder;} .obj { background-image:url('a.jpg'); width:50px; height:50px; position:absolute; top:0; left:0; } </style></head><body><div style="height:550px; border-bottom:2px solid gray;"><div class="title" >自由落体大模拟<span style="font-size:12px;">(点击图片让它落下)</span></div></div><div class="obj" id="obj" onclick="play();" ></div></body></html>

更多关于js运动相关内容感兴趣的读者可查看本站专题：《JavaScript运动效果与技巧汇总》

希望本文所述对大家jQuery程序设计有所帮助。

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