js 实现拖动效果 __按回车键，方块还能做自由落体运动。

来源：互联网发布：久其软件怎么样编辑：程序博客网时间：2024/05/02 07:17

<!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>jQuery Div拖动+键盘控制综合效果</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<script src="/ajaxjs/jquery1.3.2.js"></script>
</head>
<body>
预览时看不到效果，刷新一下即可
<div id="text" style="width:120px;height:60px;background:#F06;position:absolute;left:500px;top:90px;cursor:move;"></div>
<script type="text/javascript">
var msgObj = document.getElementById('text');
var posx = 0;
var posy = 0;
var moveable = false;
var MouseDownEvent = document.onmousedown;
var MouseMoveEvent = document.onmousemove;
var MouseUpEvent = document.onmouseup;
msgObj.onmousedown = function(evt) {
var evt = evt||window.event;
moveable = true;
posy = evt.clientY-parseInt(msgObj.style.top);
posx = evt.clientX-parseInt(msgObj.style.left);
document.onmousemove = function(evt) {
if (moveable) {
var evt = evt||window.event;
msgObj.style.left = evt.clientX - posx + "px";
msgObj.style.top = evt.clientY - posy + "px";
}
change();
};
document.onmouseup = function () {
if (moveable) {
document.onmousemove = MouseMoveEvent;
document.onmouseup = MouseUpEvent;
moveable = false;
posx = 0;
posy = 0;
}
};
}
var v=1;
var a=0.9;
var h=document.documentElement.clientHeight;
function scroll(){
var timer=setInterval(function(){
v +=a;
var top=(parseInt(msgObj.style.top)||0);
if(top+v>h-70){
if(v<2)clearInterval(timer);
msgObj.style.top=h-70+"px";
v=-v*0.5;
}else{
msgObj.style.top=top+v+"px";
}
change();
},10);
};
$(document).keyup(function(e){
var e = e || window.event ;
if(e.which == 13){
scroll();
}
})
var x = 4 ;
var y = 4 ;
function newpro(){
var Height = document.documentElement.clientHeight ;
var Width = document.documentElement.clientWidth ;
var newobj = document.createElement('div');
newobj.setAttribute('id','bigbox');
newobj.style.position = 'absolute';
newobj.style.left = 20 +"px";
newobj.style.top = 80 +"px";
newobj.style.height = Height/x +"px" ;
newobj.style.width = Width/y +"px" ;
newobj.style.borderWidth = 1+"px";
newobj.style.borderColor = "#ff6500";
newobj.style.borderStyle = 'solid' ;
newobj.innerHTML='<div id="minbox"></div>';
document.body.appendChild(newobj);
change();
}
function change(){
var minobj = document.getElementById('minbox');
minobj.style.position = 'absolute';
minobj.style.left = parseInt(msgObj.style.left)/x +"px";
minobj.style.top = parseInt(msgObj.style.top)/y +"px";
minobj.style.height = 20 +"px" ;
minobj.style.width = 30 +"px" ;
minobj.style.background = "#F06";
}
window.onload = function(){
newpro();
}
</script>
</body>
</html>