Javascript摸拟自由落体与上抛运动

By weisnet On 2010-05-01 At 11:30 View:862

XML/HTML

<!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 runat="server">
<title>模拟自由落体与上抛运动</title>
<script type="text/javascript">
var $ = function(el) { return document.getElementById(el); };
function LuoRun()
{
this.h = 0;
this.s = 0;
this.g = 9.8;
this.isup = false;
this.rh = 0;
this.t = 0;
this.timer = null;
this.mt = 0;
this.top = 0;
this.left = 0;
this.id = null;
}
LuoRun.prototype.Po = function(obj) {
this.left += 0.3;
obj.style.left = (this.left)+'px';
if (!this.isup) {
if (this.t ="=" 0)
{
this.top = obj.offsetTop;
this.h = 570 - 22 - this.top;
this.mt = Math.sqrt(2*this.h/(this.g*100));
//alert(mt+' '+isup+' '+t)
}
this.t+="0.01;"
if (this.t >= this.mt)
{
this.t = this.mt;
this.rh = (1/2)*this.g*this.t*this.t*100;
this.s = this.g*this.t*100;
obj.style.top = (this.rh+this.top)+'px';
//t = 0;
this.s = this.s-50>0 ? this.s-50 : 0;
this.isup = true;
this.t = 0;
}
else
{
this.rh = (1/2)*this.g*this.t*this.t*100;
this.s = this.g*this.t*100;
obj.style.top = (this.rh+this.top)+'px';
}
} else { //up
//return;
if (this.s ="=" 0) {
clearInterval(this.timer);
this.id.parentNode.removeChild(this.id);
return;
}
if (this.t ="=" 0) {
this.h = this.s*this.s/(2*this.g*100);
this.mt = this.s/(this.g*100);
this.top = obj.offsetTop;
//alert(mt+' '+isup+' '+t)
}
this.t+="0.01;"
if (this.t>="this.mt)" {
this.t = this.mt;
this.rh = this.s*this.t - (1/2)*this.g*this.t*this.t*100;
obj.style.top = (this.top - this.rh)+'px';
this.s = 0;
this.isup = false;
this.t = 0;
}else {
this.rh = this.s*this.t - (1/2)*this.g*this.t*this.t*100;
obj.style.top = (this.top - this.rh)+'px';
}
}
}
LuoRun.prototype.Go = function(obj) {
var self = this;
if (obj ="=" null)
obj = $('box');
self.timer = setInterval(function() {
self.Po(obj);
if (self.h<="0)" {
clearInterval(self.timer);
self.id.parentNode.removeChild(self.id);
}
},10);
}
document.onmousedown = function(e) {
e = e?e:window.event;
var crtDiv = document.createElement('div');
crtDiv.style.position = 'absolute';
crtDiv.style.left = e.clientX + 'px';
crtDiv.style.top = e.clientY + 'px';
crtDiv.style.background = '#333';
crtDiv.style.width = '22px';
crtDiv.style.height = '22px';
document.body.appendChild(crtDiv);
crtDiv.innerHTML = ' ';
var C = new LuoRun();
C.left = e.clientX;
C.id = crtDiv;
document.onmouseup = function() {
document.onmousemove = null;
window.setTimeout(function() { C.Go(crtDiv); },1000);
}
}
</script>
<style type="text/css">
td,body {font-size:12px;}
.css1 {width:240px;display:table;position:absolute;left:20px;top:20px;border:1px solid green;background:#CAF4BD;line-height:18px;padding:3px;}
.css2 {width:900px;height:22px;border-top:1px solid #333;position:absolute;top:570px;left:60px;}
</style>
</head>
<body>
<form id="form1">
<div class="css1">
名称：Javascript摸拟自由落体与上抛运动!<br />
作者：Gloot<br />
邮箱：glootz@gmail.com <br />
QQ：345268267 <br />
网站：www.weiseditor.com <br />
操作：在页面不同地方点几下
</div>
<div id="line" class="css2"> </div>
</form>
</body>
</html>