javascript无缝滚动2

Leya 发表于 2010-6-7 17:53:24

以更少的代码实现相同的效果应该是我们写程序的究极目标，当然可读性不能丢。在第一部分最后一个运行框，我已经做了这样的探索。不过换汤不换药，还是来来回回在scrollTop/scrollLeft与offsetTop/offsetLeft上做文章。总的思路基本是这样，让某个元素整体向某个方向移动，这样它里面的内容（图片或文字）就跟着移动，当元素移动到某一个距离后就回到原点。为了防止内容移着移着就没有了，我们需要两套相同的内容。在第一部分，第二套内容是动态生成的，并复制到另一个兄弟元素中，这在水平滚动时，我们需要花一些周折来让所有内容水平排列在一起。我就想，如果把第二套内容直接加在相同的元素是否效果会更好呢？起码CSS也少写一点。用scrollTop/scrollLeft实现滚动，还有一个缺点，它对父容器的宽度与高度有严格的规定的。比如我们想上下滚动图片，ul作为容器，li的图片为滚动内容，那么ul的高至少为图片的高的两倍（我们假设每张图片的尺寸都是相等的），否则就动不了。鉴此，我开发了新一代的无缝滚动函数。<ul id="marquee">
<li>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s017.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s018.jpg" alt="无缝滚动"/></a
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s019.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s020.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s021.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s022.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s023.jpg" alt="无缝滚动"/></a>
</li>
</ul>
>#marquee ,#marquee li {
padding:0;
margin:0;
}
#marquee {
position:relative;
list-style:none;
height:150px;
width:200px;
overflow:hidden;
border:10px solid #369;
}
#marquee li {
position:absolute;
}
#marquee img {
display:block;
border:0;
}
var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li"),
speed = arguments || 10,
delta = 0,//当前滚动的位置
critical = slide.offsetHeight;//临界值
slide.innerHTML += slide.innerHTML;
var rolling = function(){
delta == -critical ? delta = 0 : delta--;
slide.style.top = delta + "px";
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}
window.onload = function(){
Marquee("marquee");
}

<!doctype html>
<title>javascript无缝滚动by 司徒正美</title>
<meta charset="utf-8"/>
<meta name="keywords" content="javascript无缝滚动 by 司徒正美" />
<meta name="description" content="javascript无缝滚动by 司徒正美" />
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<style type="text/css">
h1 {
font:400 16px/1 "Microsoft YaHei",KaiTi_GB2312,SimSun
}
#marquee ,#marquee li {
padding:0;
margin:0;
}
#marquee {
position:relative;
list-style:none;
height:150px;
width:200px;
overflow:hidden;
border:10px solid #369;
}
#marquee li {
position:absolute;
}
#marquee img {
display:block;
border:0;
}
</style>
<script type="text/javascript">
var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li"),
speed = arguments || 10,
delta = 0,//当前滚动的位置
critical = slide.offsetHeight;//临界点
slide.innerHTML += slide.innerHTML;
var rolling = function(){
   delta == -critical ? delta = 0 : delta--;
   slide.style.top = delta + "px";
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}
window.onload = function(){
Marquee("marquee");
}
</script>
<h1>javascript无缝滚动(向上滚动) by 司徒正美</h1>
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<ul id="marquee">
<li>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s017.jpg" alt="无缝滚动 by 司徒正美"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s018.jpg" alt="无缝滚动 by 司徒正美"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s019.jpg" alt="无缝滚动 by 司徒正美"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s020.jpg" alt="无缝滚动 by 司徒正美"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s021.jpg" alt="无缝滚动 by 司徒正美"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s022.jpg" alt="无缝滚动 by 司徒正美"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s023.jpg" alt="无缝滚动 by 司徒正美"/></a>
</li>
</ul>
向下滚动也很容易，只不过一开始把它定位到第一套内容与第二套内容之间，也就是slide.offsetHeight，不过我们需要把它改成负数让向整体向下移动，然后再慢慢向上移动。
<!doctype html>
<title>javascript无缝滚动by 司徒正美</title>
<meta charset="utf-8"/>
<meta name="keywords" content="javascript无缝滚动 by 司徒正美" />
<meta name="description" content="javascript无缝滚动by 司徒正美" />
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<style type="text/css">
h1 {
font:400 16px/1 "Microsoft YaHei",KaiTi_GB2312,SimSun
}
#marquee ,#marquee li {
padding:0;
margin:0;
}
#marquee {
position:relative;
list-style:none;
height:150px;
width:200px;
overflow:hidden;
border:10px solid #B45B3E;
}
#marquee li {
position:absolute;
}
#marquee img {
display:block;
border:0;
}
</style>
<script type="text/javascript">
var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li"),
speed = arguments || 10,
critical = slide.offsetHeight,//临界值
delta = -critical;
slide.innerHTML += slide.innerHTML;
var rolling = function(){
   delta == 0 ? delta = -critical : delta++;
   slide.style.top = delta + "px";
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}
window.onload = function(){
Marquee("marquee");
}
</script>
<h1>javascript无缝滚动(向下滚动) by 司徒正美</h1>
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<ul id="marquee">
<li>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s017.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s018.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s019.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s020.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s021.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s022.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s023.jpg" alt="无缝滚动"/></a>
</li>
</ul>
实现水平移动也比第一部分容易，结构层完全不用改动，表现层也改动很少。#marquee ,#marquee li {
padding:0;
margin:0;
}
#marquee {
position:relative;
list-style:none;
height:150px;
width:200px;
overflow:hidden;
border:10px solid #B45B3E;
}
#marquee li {
position:absolute;
width:1000%;/*★★新增加★★*/
}
#marquee a {
float:left;/*★★新增加★★*/
}
#marquee img {
display:block;
border:0;
}
难点是如何获取那个临界值，也就是夹在第一套内容与第二个套内容之间的那个位置。由于第二套内容我们并没有外套一个元素，因此我们需要从滚动对象下手。滚动对象都是a元素，我们需要计算出第二套内容的第一个a元素到达父元素左边的距离。这个值就是我们要求的临界值。明白这点，就轻松了。 //*************略*********
slide.innerHTML += slide.innerHTML;
var item= slide.getElementsByTagName("a"),
critical = item.offsetLeft,//临界值
//*************略*********

<!doctype html>
<title>javascript无缝滚动by 司徒正美</title>
<meta charset="utf-8"/>
<meta name="keywords" content="javascript无缝滚动 by 司徒正美" />
<meta name="description" content="javascript无缝滚动by 司徒正美" />
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<style type="text/css">
h1 {
font:400 16px/1 "Microsoft YaHei",KaiTi_GB2312,SimSun
}
#marquee ,#marquee li {
padding:0;
margin:0;
}
#marquee {
position:relative;
list-style:none;
height:150px;
width:200px;
overflow:hidden;
border:10px solid #8080C0;
}
#marquee li {
position:absolute;
width:1000%;/*新增加*/
}
#marquee a {
float:left;/*新增加*/
}
#marquee img {
display:block;
border:0;
}
</style>
<script type="text/javascript">
var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li"),
speed = arguments || 10;
slide.innerHTML += slide.innerHTML;
var item= slide.getElementsByTagName("a"),
critical = item.offsetLeft,//临界值
delta = 0;
var rolling = function(){
   delta == -critical ? delta = 0 : delta--;
   slide.style.left = delta + "px";
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}
window.onload = function(){
Marquee("marquee");
}
</script>
<h1>javascript无缝滚动(向左滚动) by 司徒正美</h1>
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<ul id="marquee">
<li>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s017.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s018.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s019.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s020.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s021.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s022.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s023.jpg" alt="无缝滚动"/></a>
</li>
</ul>
下面是向右滚动，由于都是不足20行的脚本，应该一看源码就明白，不详述了。
<!doctype html>
<title>javascript无缝滚动by 司徒正美</title>
<meta charset="utf-8"/>
<meta name="keywords" content="javascript无缝滚动 by 司徒正美" />
<meta name="description" content="javascript无缝滚动by 司徒正美" />
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<style type="text/css">
h1 {
font:400 16px/1 "Microsoft YaHei",KaiTi_GB2312,SimSun
}
#marquee ,#marquee li {
padding:0;
margin:0;
}
#marquee {
position:relative;
list-style:none;
height:150px;
width:200px;
overflow:hidden;
border:10px solid #6cc;
}
#marquee li {
position:absolute;
width:1000%;
}
#marquee a {
float:left;
}
#marquee img {
display:block;
border:0;
}
</style>
<script type="text/javascript">
var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li"),
speed = arguments || 10;
slide.innerHTML += slide.innerHTML;
var item= slide.getElementsByTagName("a"),//临界点
critical = item.offsetLeft,
delta = -critical;
var rolling = function(){
   delta == 0 ? delta = -critical : delta++;
   slide.style.left = delta + "px";
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}
window.onload = function(){
Marquee("marquee");
}
</script>
<h1>javascript无缝滚动(向右滚动) by 司徒正美</h1>
<base href="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/">
<ul id="marquee">
<li>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s017.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s018.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s019.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s020.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s021.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s022.jpg" alt="无缝滚动"/></a>
<a href="http://www.cnblogs.com/rubylouvre/"><img src="o_s023.jpg" alt="无缝滚动"/></a>
</li>
</ul>
我们可以把上面四个函数合并成一个函数，结构层与表现层参照向上滚动。var Marquee = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li"),
options = arguments || {},
speed = options.speed || 10,
direction = options.direction || "left";
slide.innerHTML += slide.innerHTML;
var item= slide.getElementsByTagName("a"),
critical,delta,rolling,field;
if(direction == "left" || direction == "right"){
slide.style.cssText = "width:1000%";
for(var i=0 ,l=item.length; i<l;i++){
item.style.cssText = "float:left";
}
field = "left";
critical = item.offsetLeft;
}else if(direction == "up" || direction == "down"){
field = "top";
critical = item.offsetTop;
}
if(direction == "up" || direction == "left"){
delta = 0;
rolling = function(){
delta == -critical ? delta = 0 : delta--;
slide.style= delta + "px";
}
}else if(direction == "down" || direction == "right"){
delta = -critical;
rolling = function(){
delta == 0 ? delta = -critical : delta++;
slide.style = delta + "px";
}
}
var timer = setInterval(rolling,speed)//设置定时器
container.onmouseover=function() {clearInterval(timer)}//鼠标移到marquee上时，清除定时器，停止滚动
container.onmouseout=function() {timer=setInterval(rolling,speed)}//鼠标移开时重设定时器
}
使用：Marquee("marquee",{speed:35,direction:"up"});

@k-47 发表于 2010-6-8 00:28:56

(ppb096^写的这么累都有没一个跟贴的，你们太没有良心了，

铁十字勋章 发表于 2010-6-8 07:41:45

不知道做啥的啊

zzaa2018 发表于 2010-6-8 12:24:25

不知道干什么的啊。

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javascript无缝滚动2