js实现左右切换轮播图思路

JavaScript04

js实现左右切换轮播图思路,第1张

我们在 CSS 阶段就已经接触到轮播图。通过轮播图我们可以达到一些好玩的特效，但使用 CSS 做出来的轮播图只有左右切换，渐变切换和简单的点击切换。局限性较大，观看效果也不佳。但当我们接触 js 之后，你就发现使用js来实现轮播图后，在看CSS实现轮播的效果就是...。我想说啥你知道的。废话不多说，咱们一起看看如何使用js来实现轮播效果。

（本文以阴阳师中“平安世界”模块的轮播图为例）

这个轮播图，我们通过两大模块构成；左右点击模块和姓名点击模块。然后在两者相关联来达到最终的效果。

在使用js实现轮播图的效果前，先使用HTML和CSS完善这一模块的布局。

本轮播图使用8张图片。每次出现两张。我们在使用HTML和CSS布局时可以先把第一组的两张图片放好位置。其他的放在两边隐藏起来。需要使用的时候在出现移动到中间。

左右点击切换模块：

我们通过对左右按钮进行点击监听。在点击后做出反应。左右点击的思路一样。我们先说一下右边按钮点击事件。

当我们点击右边按钮后，我们通过对点击次数进行累计。此处我使用初始化常量然后累加最后通过判断来达到循环效果

对每一张图片进行编码，以此来达到循环切换图片的效果。在切换图片时，我们可以使用排他思想。当点击按钮切换下一张图片的时候，我们可以先遍历所有的图片，把所有的图片移动到两边，然后将要移动的图片移动到中央来达到切换效果

在移动的过程中的动画和定时器设置的延迟可以自己添加一下。

左边按钮的原理和右边一样反操作即可。注意常量要使用一个。否则两个按钮都只能单方向运动，可能还会出现其他问题。

本次现讲一下左右切换的思路。

这段代码可以： <!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/htmlcharset=gb2312" /><title>图片</title><script language="javascript"><!-- //图片滚动列表 mengjia 070927 var Speed_1 = 10//速度(毫秒) var Space_1 = 20//每次移动(px) var PageWidth_1 = 116 * 3//翻页宽度 var interval_1 = 7000//翻页间隔 var fill_1 = 0//整体移位 var MoveLock_1 = falsevar MoveTimeObj_1var MoveWay_1="right"var Comp_1 = 0var AutoPlayObj_1=nullfunction GetObj(objName){if(document.getElementById){return eval('document.getElementById("'+objName+'")')}else{return eval('document.all.'+objName)}} function AutoPlay_1(){clearInterval(AutoPlayObj_1)AutoPlayObj_1=setInterval('ISL_GoDown_1()ISL_StopDown_1()',interval_1)} function ISL_GoUp_1(){if(MoveLock_1)returnclearInterval(AutoPlayObj_1)MoveLock_1=trueMoveWay_1="left"MoveTimeObj_1=setInterval('ISL_ScrUp_1()',Speed_1)} function ISL_StopUp_1(){if(MoveWay_1 == "right"){return}clearInterval(MoveTimeObj_1)if((GetObj('ISL_Cont_1').scrollLeft-fill_1)%PageWidth_1!=0){Comp_1=fill_1-(GetObj('ISL_Cont_1').scrollLeft%PageWidth_1)CompScr_1()}else{MoveLock_1=false} AutoPlay_1()} function ISL_ScrUp_1(){if(GetObj('ISL_Cont_1').scrollLeft<=0){GetObj('ISL_Cont_1').scrollLeft=GetObj('ISL_Cont_1').scrollLeft+GetObj('List1_1').offsetWidth} GetObj('ISL_Cont_1').scrollLeft-=Space_1} function ISL_GoDown_1(){clearInterval(MoveTimeObj_1)if(MoveLock_1)returnclearInterval(AutoPlayObj_1)MoveLock_1=trueMoveWay_1="right"ISL_ScrDown_1()MoveTimeObj_1=setInterval('ISL_ScrDown_1()',Speed_1)} function ISL_StopDown_1(){if(MoveWay_1 == "left"){return}clearInterval(MoveTimeObj_1)if(GetObj('ISL_Cont_1').scrollLeft%PageWidth_1-(fill_1>=0?fill_1:fill_1+1)!=0){Comp_1=PageWidth_1-GetObj('ISL_Cont_1').scrollLeft%PageWidth_1+fill_1CompScr_1()}else{MoveLock_1=false} AutoPlay_1()} function ISL_ScrDown_1(){if(GetObj('ISL_Cont_1').scrollLeft>=GetObj('List1_1').scrollWidth){GetObj('ISL_Cont_1').scrollLeft=GetObj('ISL_Cont_1').scrollLeft-GetObj('List1_1').scrollWidth} GetObj('ISL_Cont_1').scrollLeft+=Space_1} function CompScr_1(){if(Comp_1==0){MoveLock_1=falsereturn} var num,TempSpeed=Speed_1,TempSpace=Space_1if(Math.abs(Comp_1)<PageWidth_1/2){TempSpace=Math.round(Math.abs(Comp_1/Space_1))if(TempSpace<1){TempSpace=1}} if(Comp_1<0){if(Comp_1<-TempSpace){Comp_1+=TempSpacenum=TempSpace}else{num=-Comp_1Comp_1=0} GetObj('ISL_Cont_1').scrollLeft-=numsetTimeout('CompScr_1()',TempSpeed)}else{if(Comp_1>TempSpace){Comp_1-=TempSpacenum=TempSpace}else{num=Comp_1Comp_1=0} GetObj('ISL_Cont_1').scrollLeft+=numsetTimeout('CompScr_1()',TempSpeed)}} function picrun_ini(){ GetObj("List2_1").innerHTML=GetObj("List1_1").innerHTMLGetObj('ISL_Cont_1').scrollLeft=fill_1>=0?fill_1:GetObj('List1_1').scrollWidth-Math.abs(fill_1)GetObj("ISL_Cont_1").onmouseover=function(){clearInterval(AutoPlayObj_1)} GetObj("ISL_Cont_1").onmouseout=function(){AutoPlay_1()} AutoPlay_1()} //产品展示滚动图片结束 //--></script><style type="text/css"><!-- BODY { BORDER-TOP-WIDTH: 0pxBORDER-LEFT-WIDTH: 0pxFONT-SIZE: 12pxBORDER-BOTTOM-WIDTH: 0pxMARGIN: 0pxFONT-FAMILY: 宋体BACKGROUND-COLOR: #fffBORDER-RIGHT-WIDTH: 0px } .blk_18 { BORDER-RIGHT: #e3e3e3 1px solidBORDER-TOP: #e3e3e3 1px solidMARGIN-TOP: 8pxFONT-SIZE: 12pxBACKGROUND: #f3f3f3OVERFLOW: hiddenBORDER-LEFT: #e3e3e3 1px solidWIDTH: 390pxBORDER-BOTTOM: #e3e3e3 1px solidZOOM: 1 } .blk_18 .pcont { FLOAT: leftOVERFLOW: hiddenWIDTH: 350px } .blk_18 .ScrCont { WIDTH: 32766pxZOOM: 1 } .blk_18 #List1_1 { FLOAT: left } .blk_18 #List2_1 { FLOAT: left } .blk_18 .LeftBotton { BACKGROUND: url( http://img.china.alibaba.com/images/unsort/module/picr_1.gif ) no-repeatFLOAT: leftMARGIN: 10px 1pxWIDTH: 15pxHEIGHT: 72px } .blk_18 .RightBotton { BACKGROUND: url( http://img.china.alibaba.com/images/unsort/module/picr_1.gif ) no-repeatFLOAT: leftMARGIN: 10px 1pxWIDTH: 15pxHEIGHT: 72px } .blk_18 .LeftBotton { BACKGROUND-POSITION: 0px 0pxMARGIN-LEFT: 5px } .blk_18 .RightBotton { BACKGROUND-POSITION: 0px -100pxMARGIN-LEFT: -1px } .blk_18 .LeftBotton:hover { BACKGROUND-POSITION: -20px 0px } .blk_18 .RightBotton:hover { BACKGROUND-POSITION: -20px -100px } .blk_18 .pl IMG { DISPLAY: blockMARGIN: 6px auto 1pxCURSOR: pointerBORDER-TOP-STYLE: noneBORDER-RIGHT-STYLE: noneBORDER-LEFT-STYLE: noneBORDER-BOTTOM-STYLE: none } .blk_18 .pl { BORDER-RIGHT: #f3f3f3 1px solidBORDER-TOP: #f3f3f3 1px solidFLOAT: leftBORDER-LEFT: #f3f3f3 1px solidWIDTH: 114pxLINE-HEIGHT: 24pxBORDER-BOTTOM: #f3f3f3 1px solidTEXT-ALIGN: centerTEXT-DECORATION: underline } .blk_18 A.pl:hover { BORDER-RIGHT: #ff9900 1px solidBORDER-TOP: #ff9900 1px solidBACKGROUND: #fffBORDER-LEFT: #ff9900 1px solidCOLOR: #ff9900BORDER-BOTTOM: #ff9900 1px solid } .commu_cont3 { MARGIN: 9px 7px 7pxLINE-HEIGHT: 150% } .commu_cont3 UL { WIDTH: 188px } --></style></head><body><!-- picrotate_left start --><DIV class=blk_18><A onmouseup=ISL_StopUp_1() class=LeftBotton onmousedown=ISL_GoUp_1() onmouseout=ISL_StopUp_1() href="javascript:void(0)" target=_self></A><DIV class=pcont id=ISL_Cont_1><DIV class=ScrCont><DIV id=List1_1><!-- piclist begin --><A class=pl href=" http://info.china.alibaba.com/news/detail/v3000103-d1002527920.html" target=_blank><IMG height=72 alt=20-50元夏装抢疯 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>美女小凡最新夏装</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5000180-d1002468482.html" target=_blank><IMG height=72 alt=韩国人气小耳环 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>韩国人气小耳环</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v9-d1002531301.html" target=_blank><IMG height=72 alt=3万6超值装修88平 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>3万6超值装修88平</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v8-d1002530067.html" target=_blank><IMG height=72 alt=牛干巴敲开财富门 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>牛干巴敲开财富门</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5003519-d1002285304.html" target=_blank><IMG height=72 alt=4K至7K高性能本本 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>4K至7K高性能本本</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5001800-d1002511645.html" target=_blank><IMG height=72 alt=7万装修102平婚房 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>7万装修102平婚房</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5003463-d1002527336.html" target=_blank><IMG height=72 alt=最新小车节油为主 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>最新小车节油为主</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v5003000-d1002505656.html" target=_blank><IMG height=72 alt="热门项目 BT烤翅" src=" http://www.baidu.com/img/baidu_logo.gif" width=96>热门项目 BT烤翅</A><A class=pl href=" http://info.china.alibaba.com/news/detail/v3000103-d1002421590.html" target=_blank><IMG height=72 alt=流行T恤+裤装 src=" http://www.baidu.com/img/baidu_logo.gif" width=96>要显瘦就这么穿！</A><!-- piclist end --></DIV><DIV id=List2_1></DIV></DIV></DIV><A onmouseup=ISL_StopDown_1() class=RightBotton onmousedown=ISL_GoDown_1() onmouseout=ISL_StopDown_1() href="javascript:void(0)" target=_self></A></DIV><SCRIPT type=text/javascript><!-- picrun_ini() //--></SCRIPT><!-- picrotate_left end --></body></html>

不是很简单一两句话能说清楚地，需要HTML, CSS和javascript的配合。我大概说下做法，你需要自己写写试试看

首先把你的div设置style为overflow hidden

然后在div里面再添加一个div，假设叫做imgcontainer，在里面存放所有图片，图片以float: left方式显示，每个图片的宽度你是知道的，这样图片的个数*每个图片的宽度（必要的话再加上图片之间的间隔）设置为imgcontainer的总宽度。然后把div的宽度设置为显示3个图片的宽度。这样就可以保证只显示3个图片，多余的图片看不到。

然后在点击左右2个按钮的时候添加事件，每点击一次，让imgcontainer的marginLeft增加或减少一个图片的宽度（同样必要的时候加上图片之间的间隔距离），这样就使得图片列表在左右移动了。

下面是我的一个例子，跟你的需求可能不完全一样，大概做下参考：

HTML片段

<div id="pagecontent" class="pagecontent">

<div id="nav_thumbs_prev" class="disabled" onclick="NavThumbsPrev()"></div>

<div id="photolist_container">

<ol id="photolist" class="photolist">

<li><figure onclick="ViewPhoto(this,'aaaaa')"><div class="samplecontainer"><img src="./img/singularity.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">aaaaa</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'bbbbb')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">bbbbb</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'cccc')"><div class="samplecontainer"><img src="./img/newborn.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">cccc</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'dddd')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">dddd</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'eeee')"><div class="samplecontainer"><img src="./img/singularity.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">eeee</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'ffff')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">ffff</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'gggg')"><div class="samplecontainer"><img src="./img/newborn.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">gggg</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'hhhh')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">hhhh</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'iiii')"><div class="samplecontainer"><img src="./img/newborn.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">iiii</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'jjjj')"><div class="samplecontainer"><img src="./img/singularity.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">jjjj</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'kkkk')"><div class="samplecontainer"><img src="./img/newborn.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">kkkk</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'llll')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">llll</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'mmmm')"><div class="samplecontainer"><img src="./img/singularity.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">mmmm</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'nnnn')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">nnnn</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'oooo')"><div class="samplecontainer"><img src="./img/singularity.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">oooo</figcaption></figure></li>

<li><figure onclick="ViewPhoto(this,'pppp')"><div class="samplecontainer"><img src="./img/pyre.jpg" onload="javascript:DrawSampleImage(this)" border="0" ></div><figcaption class="imagename">pppp</figcaption></figure></li>

</ol>

</div>

<div id="nav_thumbs_next" onclick="NavThumbsNext()"></div>

</div>

CSS部分

.photolist_container {

margin: 0

/*Firefox*/

width: -moz-calc(100% - 30px)

/*chrome safari*/

width: -webkit-calc(100% - 30px)

/*Standard */

width: calc(100% - 30px)

float: left

height: 140px

overflow: hidden

}

ol.photolist {

background-color: black

margin: 0

margin-left: 1px

padding: 0

list-style: none

height: auto

padding: 0

display: block

height: 125px

}

ol.photolist>li {

margin: 0

margin-left: -1px

padding: 4px

text-align:center

display:inline

float: left

border: 1px solid #FF6699

width: 100px

}

#photolist figure {

margin: 0

padding: 0

text-align:center

border: 1px solid #000000

cursor: pointer

}

.samplecontainer {

height: 100px

width: 100px

text-align: center

margin: 0

padding: 0

border: 0

display: table-cell

vertical-align: middle

}

.samplecontainer>img {

margin: 0

padding: 0

border: 0

vertical-align:middle

}

Javascript部分

function MovePhotoList(size) {

var photolist = document.getElementById("photolist")

var marginLeft = 1

if (photolist.style.marginLeft != "")

marginLeft = parseInt(photolist.style.marginLeft)

marginLeft = marginLeft + size

if (marginLeft <(document.getElementById("photolist_container").offsetWidth - photolist.offsetWidth))

{

marginLeft = document.getElementById("photolist_container").offsetWidth - photolist.offsetWidth

document.getElementById("nav_thumbs_next").setAttribute("class", "disabled")

}

else

{

document.getElementById("nav_thumbs_next").setAttribute("class", "enable")

}

if (marginLeft >1)

{

marginLeft = 1

document.getElementById("nav_thumbs_prev").setAttribute("class", "disabled")

}

else

{

document.getElementById("nav_thumbs_prev").setAttribute("class", "enable")

}

photolist.style.marginLeft = marginLeft + "px"

}

function NavThumbsPrev() {

var nav_thumbs_prev = document.getElementById("nav_thumbs_prev")

if (nav_thumbs_prev.getAttribute("class") != "disabled") {

MovePhotoList(56)

}

}

function NavThumbsNext() {

var nav_thumbs_next = document.getElementById("nav_thumbs_next")

if (nav_thumbs_next.getAttribute("class") != "disabled") {

MovePhotoList(-56)

}

}