常用JS图片滚动（无缝、平滑、上下左右滚动）代码大全
innerHTML: 设置或获取位于对象起始和结束标签内的 HTML
scrollHeight: 获取对象的滚动高度。
scrollLeft: 设置或获取位于对象左边界和窗口中目前可见内容的最左端之间的距离
scrollTop: 设置或获取位于对象最顶端和窗口中可见内容的最顶端之间的距离
scrollWidth: 获取对象的滚动宽度
offsetHeight: 获取对象相对于版面或由父坐标 offsetParent 属性指定的父坐标的高度
offsetLeft: 获取对象相对于版面或由 offsetParent 属性指定的父坐标的计算左侧位置
offsetTop: 获取对象相对于版面或由 offsetTop 属性指定的父坐标的计算顶端位置
offsetWidth: 获取对象相对于版面或由父坐标 offsetParent 属性指定的父坐标的宽度
以下包含四种方向的滚动代码，粗体部分需要自行修改，可修改成更复杂的代码，如图文混排、加边框、限制图片大小等。
增大width时，应该相应增加一些图片（应该是使所有图片组成的总宽度大于设定的width），即使是重复的，否则会在滚动一会儿后停下来，图片不宜太大，否则在IE下滚动缓慢!
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<!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=gb2312" />
<title>向上下左右不间断无缝滚动图片的效果(兼容火狐和IE)</title>
</head>
<body>
<div id="colee" style="overflow:hidden;height:253px;width:410px;">
<div id="colee1">
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
</div>
<div id="colee2"></div>
</div>
<script>
var speed=30;
var colee2=document.getElementById("colee2");
var colee1=document.getElementById("colee1");
var colee=document.getElementById("colee");
colee2.innerHTML=colee1.innerHTML; //克隆colee1为colee2
function Marquee1(){
//当滚动至colee1与colee2交界时
if(colee2.offsetTop-colee.scrollTop<=0){
colee.scrollTop-=colee1.offsetHeight; //colee跳到最顶端
}else{
colee.scrollTop++
}
}
var MyMar1=setInterval(Marquee1,speed)//设置定时器
//鼠标移上时清除定时器达到滚动停止的目的
colee.onmouseover=function() {clearInterval(MyMar1)}
//鼠标移开时重设定时器
colee.onmouseout=function(){MyMar1=setInterval(Marquee1,speed)}
</script>
<!--向上滚动代码结束-->
<br>
<!--下面是向下滚动代码-->
<div id="colee_bottom" style="overflow:hidden;height:253px;width:410px;">
<div id="colee_bottom1">
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
<p><img src="/jscss/demoimg/200907/bg3.jpg"></p>
</div>
<div id="colee_bottom2"></div>
</div>
<script>
var speed=30
var colee_bottom2=document.getElementById("colee_bottom2");
var colee_bottom1=document.getElementById("colee_bottom1");
var colee_bottom=document.getElementById("colee_bottom");
colee_bottom2.innerHTML=colee_bottom1.innerHTML
colee_bottom.scrollTop=colee_bottom.scrollHeight
function Marquee2(){
if(colee_bottom1.offsetTop-colee_bottom.scrollTop>=0)
colee_bottom.scrollTop+=colee_bottom2.offsetHeight
else{
colee_bottom.scrollTop--
}
}
var MyMar2=setInterval(Marquee2,speed)
colee_bottom.onmouseover=function() {clearInterval(MyMar2)}
colee_bottom.onmouseout=function() {MyMar2=setInterval(Marquee2,speed)}
</script>
<!--向下滚动代码结束-->
<br>
<!--下面是向左滚动代码-->
<div id="colee_left" style="overflow:hidden;width:500px;">
<table cellpadding="0" cellspacing="0" border="0">
<tr><td id="colee_left1" valign="top" align="center">
<table cellpadding="2" cellspacing="0" border="0">
<tr align="center">
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
</tr>
</table>
</td>
<td id="colee_left2" valign="top"></td>
</tr>
</table>
</div>
<script>
//使用div时，请保证colee_left2与colee_left1是在同一行上.
var speed=30//速度数值越大速度越慢
var colee_left2=document.getElementById("colee_left2");
var colee_left1=document.getElementById("colee_left1");
var colee_left=document.getElementById("colee_left");
colee_left2.innerHTML=colee_left1.innerHTML
function Marquee3(){
if(colee_left2.offsetWidth-colee_left.scrollLeft<=0)//offsetWidth 是对象的可见宽度
colee_left.scrollLeft-=colee_left1.offsetWidth//scrollWidth 是对象的实际内容的宽，不包边线宽度
else{
colee_left.scrollLeft++
}
}
var MyMar3=setInterval(Marquee3,speed)
colee_left.onmouseover=function() {clearInterval(MyMar3)}
colee_left.onmouseout=function() {MyMar3=setInterval(Marquee3,speed)}
</script>
<!--向左滚动代码结束-->
<br>
<!--下面是向右滚动代码-->
<div id="colee_right" style="overflow:hidden;width:500px;">
<table cellpadding="0" cellspacing="0" border="0">
<tr><td id="colee_right1" valign="top" align="center">
<table cellpadding="2" cellspacing="0" border="0">
<tr align="center">
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
<td><p><img src="/jscss/demoimg/200907/bg3.jpg"></p></td>
</tr>
</table>
</td>
<td id="colee_right2" valign="top"></td>
</tr>
</table>
</div>
<script>
var speed=30//速度数值越大速度越慢
var colee_right2=document.getElementById("colee_right2");
var colee_right1=document.getElementById("colee_right1");
var colee_right=document.getElementById("colee_right");
colee_right2.innerHTML=colee_right1.innerHTML
function Marquee4(){
if(colee_right.scrollLeft<=0)
colee_right.scrollLeft+=colee_right2.offsetWidth
else{
colee_right.scrollLeft--
}
}
var MyMar4=setInterval(Marquee4,speed)
colee_right.onmouseover=function() {clearInterval(MyMar4)}
colee_right.onmouseout=function() {MyMar4=setInterval(Marquee4,speed)}
</script>
<!--向右滚动代码结束-->
</body>
</html>
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