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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