原文地址：http://www.monoideas.com/read/?id=123
在用Maxthon的时候无意看到一个浮动框，把它改成基于jquery的，扩展性比较好，发来分享下。
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
body
{
height:2000px;
}
.float_mx{
background:#CCC;
100px;
height:100px;
display:none;
}
</style>
</head>
<body>
<div class="float_mx">
在此添加内容
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
(function($) {
$.fn.scrollBox = function(options){
var defaultOptions = {
speed: 0.1, //加速
time: 16, //移动速度
top: 200, //默认顶部
align: 'right', //浮动位置，可选左、右
mix: 0 //边距
};
var options = $.extend(defaultOptions, options);
this.each(function(){
var obj = $(this);
init();
function init(){
obj.css('display', 'block');
obj.css('position', 'absolute');
obj.css(options.align, options.mix);
obj.css('top', options.top+'px');
obj.css('z-index', '99');
move();
}
function back() {
acceleration = options.speed;
time = options.time;
var x1 = 0;
var y1 = 0;
var x2 = 0;
var y2 = 0;
if (document.documentElement) {
x1 = document.documentElement.scrollLeft || 0;
y1 = document.documentElement.scrollTop || 0;
}
if (document.body) {
x2 = document.body.scrollLeft || 0;
y2 = document.body.scrollTop || 0;
}
var x = Math.max(x1, x2);
var y = Math.max(y1, y2);
var speed = acceleration;
return {
l: x,
t: y,
s: speed
};
};
function move(){
var tip = obj;
var old = options.top;
var pos = back().t;
pos = pos - $(tip).Coordinate().y + options.top;
pos = $(tip).Coordinate().y + pos / 10;
if (pos < options.top) {
pos = options.top;
}
if (pos != old) {
tip.css('top',pos + "px");
}
old = pos;
window.setTimeout(function(){move();}, options.time);
};
});
};
$.fn.Coordinate = function(){
var E = $(this)[0];
var C = E.offsetTop;
var B = E.offsetLeft;
var A = E.offsetWidth;
var D = E.offsetHeight;
while (E = E.offsetParent) {
C += E.offsetTop;
B += E.offsetLeft;
}
return {
x: B,
y: C,
w: A,
h: D
};
};
})(jQuery);
$('.float_mx').scrollBox();
</script>
</body>
</html>
把下面这段代理放到单独的js文件中，代码中的css代码可以删掉，display设为none，是为了避免在页面未加载完，显示不正确的问题。
(function($) {
$.fn.scrollBox = function(options){
var defaultOptions = {
speed: 0.1, //加速
time: 16, //移动速度
top: 200, //默认顶部
align: 'right', //浮动位置，可选左、右
mix: 0 //边距
};
var options = $.extend(defaultOptions, options);
this.each(function(){
var obj = $(this);
init();
function init(){
obj.css('display', 'block');
obj.css('position', 'absolute');
obj.css(options.align, options.mix);
obj.css('top', options.top+'px');
obj.css('z-index', '99');
move();
}
function back() {
acceleration = options.speed;
time = options.time;
var x1 = 0;
var y1 = 0;
var x2 = 0;
var y2 = 0;
if (document.documentElement) {
x1 = document.documentElement.scrollLeft || 0;
y1 = document.documentElement.scrollTop || 0;
}
if (document.body) {
x2 = document.body.scrollLeft || 0;
y2 = document.body.scrollTop || 0;
}
var x = Math.max(x1, x2);
var y = Math.max(y1, y2);
var speed = acceleration;
return {
l: x,
t: y,
s: speed
};
};
function move(){
var tip = obj;
var old = options.top;
var pos = back().t;
pos = pos - $(tip).Coordinate().y + options.top;
pos = $(tip).Coordinate().y + pos / 10;
if (pos < options.top) {
pos = options.top;
}
if (pos != old) {
tip.css('top',pos + "px");
}
old = pos;
window.setTimeout(function(){move();}, options.time);
};
});
};
$.fn.Coordinate = function(){
var E = $(this)[0];
var C = E.offsetTop;
var B = E.offsetLeft;
var A = E.offsetWidth;
var D = E.offsetHeight;
while (E = E.offsetParent) {
C += E.offsetTop;
B += E.offsetLeft;
}
return {
x: B,
y: C,
w: A,
h: D
};
};
})(jQuery);