真爱无限的知识驿站

js替代marquee实现图片无缝滚动

可能大家都碰到过，当marquee中滚动的是图片的时候，滚到终点的时候直接就跳回到起点了，而不像文字那样可以无缝滚动，下面介绍的是通过js来实现图片的无缝滚动。

先了解一下下面这几个属性：

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

-----------------------------------------------------------------------

图片向上无缝滚动

<style type="text/css">

<!--

#demo {

background: #FFF;

overflow:hidden;

border: 1px dashed #CCC;

height: 100px;

text-align: center;

float: left;

}

#demo img {

border: 3px solid #F2F2F2;

display: block;

}

-->

</style>

向上滚动

<div id="demo">

<div id="demo1">

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

</div>

<div id="demo2"></div>

</div>

<script>

<!--

var speed=10; //数字越大速度越慢

var tab=document.getElementByIdx_x("demo");

var tab1=document.getElementByIdx_x("demo1");

var tab2=document.getElementByIdx_x("demo2");

tab2.innerHTML=tab1.innerHTML; //克隆demo1为demo2

function Marquee(){

if(tab2.offsetTop-tab.scrollTop<=0)//当滚动至demo1与demo2交界时

tab.scrollTop-=tab1.offsetHeight //demo跳到最顶端

else{

tab.scrollTop++

}

}

var MyMar=setInterval(Marquee,speed);

tab.onmouseover=function() {clearInterval(MyMar)};//鼠标移上时清除定时器达到滚动停止的目的

tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};//鼠标移开时重设定时器

-->

</script>

------------------------------------------------------------

图片向下无缝滚动

<style type="text/css">

<!--

#demo {

background: #FFF;

overflow:hidden;

border: 1px dashed #CCC;

height: 100px;

text-align: center;

float: left;

}

#demo img {

border: 3px solid #F2F2F2;

display: block;

}

-->

</style>

向下滚动

<div id="demo">

<div id="demo1">

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

</div>

<div id="demo2"></div>

</div>

<script>

<!--

var speed=10; //数字越大速度越慢

var tab=document.getElementByIdx_x("demo");

var tab1=document.getElementByIdx_x("demo1");

var tab2=document.getElementByIdx_x("demo2");

tab2.innerHTML=tab1.innerHTML; //克隆demo1为demo2

tab.scrollTop=tab.scrollHeight

function Marquee(){

if(tab1.offsetTop-tab.scrollTop>=0)//当滚动至demo1与demo2交界时

tab.scrollTop+=tab2.offsetHeight //demo跳到最顶端

else{

tab.scrollTop--

}

}

var MyMar=setInterval(Marquee,speed);

tab.onmouseover=function() {clearInterval(MyMar)};//鼠标移上时清除定时器达到滚动停止的目的

tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};//鼠标移开时重设定时器

-->

</script>

--------------------------------------------------------

图片向左无缝滚动

<style type="text/css">

<!--

#demo {

background: #FFF;

overflow:hidden;

border: 1px dashed #CCC;

width: 500px;

}

#demo img {

border: 3px solid #F2F2F2;

}

#indemo {

float: left;

width: 800%;

}

#demo1 {

float: left;

}

#demo2 {

float: left;

}

-->

</style>

向左滚动

<div id="demo">

<div id="indemo">

<div id="demo1">

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

</div>

<div id="demo2"></div>

</div>

</div>

<script>

<!--

var speed=10; //数字越大速度越慢

var tab=document.getElementByIdx_x("demo");

var tab1=document.getElementByIdx_x("demo1");

var tab2=document.getElementByIdx_x("demo2");

tab2.innerHTML=tab1.innerHTML;

function Marquee(){

if(tab2.offsetWidth-tab.scrollLeft<=0)

tab.scrollLeft-=tab1.offsetWidth

else{

tab.scrollLeft++;

}

}

var MyMar=setInterval(Marquee,speed);

tab.onmouseover=function() {clearInterval(MyMar)};

tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};

-->

</script>

------------------------------------------------------

图片向右无缝滚动

<style type="text/css">

<!--

#demo {

background: #FFF;

overflow:hidden;

border: 1px dashed #CCC;

width: 500px;

}

#demo img {

border: 3px solid #F2F2F2;

}

#indemo {

float: left;

width: 800%;

}

#demo1 {

float: left;

}

#demo2 {

float: left;

}

-->

</style>

向右滚动

<div id="demo">

<div id="indemo">

<div id="demo1">

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

<a href="#"><img src="upload/201205201500018031.gif" border="0" /></a>

</div>

<div id="demo2"></div>

</div>

</div>

<script>

<!--

var speed=10; //数字越大速度越慢

var tab=document.getElementByIdx_x("demo");

var tab1=document.getElementByIdx_x("demo1");

var tab2=document.getElementByIdx_x("demo2");

tab2.innerHTML=tab1.innerHTML;

function Marquee(){

if(tab.scrollLeft<=0)

tab.scrollLeft+=tab2.offsetWidth

else{

tab.scrollLeft--;

}

}

var MyMar=setInterval(Marquee,speed);

tab.onmouseover=function() {clearInterval(MyMar)};

tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};

-->

</script>