用原生js编写写焦点图脚本

来源：互联网发布：java函数重载的条件编辑：程序博客网时间：2024/06/06 01:48

自己用原生js写的简单焦点图，算是对原生js初步运用

-----------------------------------------------------html部分

-----------------------------------------------------js部分

window.onload = function(){

/*焦点图特效*/
var mPhoto = document.getElementById("mPhoto");
var imgWrap = document.getElementsByClassName("imgWrap")[0];
var wrapSize = 4; /*图片容器最大显示图片数*/
if(imgWrap.getElementsByTagName("section").length>wrapSize){
imgWrap.innerHTML = imgWrap.innerHTML+imgWrap.innerHTML;
}

var oImages = imgWrap.getElementsByTagName("section");
for(var i = 0 ; i<oImages.length; i++)
{
oImages[i].onmouseover = function()
{
for(var j = 0 ; j<oImages.length; j++)
{
removeClass(oImages[j],"on");
}
var imgSrc = this.getElementsByTagName("img")[0].src;
addClass(this,"on");
mPhoto.getElementsByTagName("img")[0].src = imgSrc;
}
}

/*上下翻页容器*/
var oPrevNext = document.getElementsByClassName("prevNext")[0];
var oPrev = oPrevNext.getElementsByClassName("prev")[0];
var oNext = oPrevNext.getElementsByClassName("next")[0];
var oImageHeight = oImages[0].getElementsByTagName("img")[0].height||0;
var oPositionTop = imgWrap.offsetTop;
var imgIndex = 0;

if(oImages.length>wrapSize*2)
{
oPrev.style.display = "block";
oNext.style.display = "block";
}

/*上一页*/
oPrev.onclick=function()
{
imgIndex-=1;
if(imgIndex<=0){
imgIndex = 6;
}

var oTop = imgIndex*(oImageHeight+8);
imgWrap.style.top = -oTop+"px";

/*获取当前图片的索引*/
for(var i = 0 ; i<oImages.length; i++)
{
var oBol = hasClass(oImages[i],"on")||false;
if(oBol){
var index = oIndex(oImages[i],oImages);
index=index-1;
if(imgIndex==6){
index = 6;
}
for(var j = 0 ; j<oImages.length; j++)
{/*清除其他的图片on样式*/
removeClass(oImages[j],"on");
}
addClass(oImages[index],"on");
var imgSrc = oImages[index].getElementsByTagName("img")[0].src;
mPhoto.getElementsByTagName("img")[0].src = imgSrc;

return false;
}
}
}

/*下一页*/
oNext.onclick = function()
{
imgIndex+=1;
if(imgIndex>=6){
imgIndex = 0;
}
var oTop = imgIndex*(oImageHeight+8);
imgWrap.style.top = -oTop+"px";

/*获取当前图片的索引*/
for(var i = 0 ; i<oImages.length; i++)
{
var oBol = hasClass(oImages[i],"on")||false;
if(oBol){
var index = oIndex(oImages[i],oImages);
index=index+1;
if(imgIndex==0){
index = 1;
}
for(var j = 0 ; j<oImages.length; j++)
{/*清除其他的图片on样式*/
removeClass(oImages[j],"on");
}
addClass(oImages[index],"on");
var imgSrc = oImages[index].getElementsByTagName("img")[0].src;
mPhoto.getElementsByTagName("img")[0].src = imgSrc;

return false;
}
}

}
}

function hasClass(element,cName)
{//检查class是否存在
return !!element.className.match(new RegExp('(\\s|^)'+cName+'(\\s|$)'));
}
function addClass(element,cName)
{//添加一个class
if(!hasClass(element,cName))
{
element.className +=' '+cName;
}
}
function removeClass(element,cName)
{//移除一个class
if(hasClass(element,cName))
{
element.className = element.className.replace(new RegExp('(\\s|^)'+cName+'(\\s|$)'),' ');
}
}

function oIndex(current, obj)
{/*获取索引*/
for (var i = 0, length = obj.length; i<length; i++)
{
if (obj[i] == current)
{
return i;
}
}

}

---------------------------------------------------css部分

.productInfo .focusPicture{
width: 698px;
float: left;
position: relative;
border-right: 1px solid #d9cdb4;
}
.productInfo .focusPicture .mPhoto{
width: 542px;
height: 360px;

}
.productInfo .focusPicture .mPhoto img{
width: 100%;
height: 100%;
}

.productInfo .focusPicture .oPhoto{
width: 128px;
height: 352px;
position: absolute;
right: 14px;
top: 4px;
overflow: hidden;

}

.productInfo .oPhoto div{
width: 128px;
position: absolute;
left:0;
top:0;
-webkit-transition: top .2s ease-out;
-moz-transition: top .2s ease-out;
transition: top .2s ease-out;
}
.productInfo .oPhoto section{
height: 78px;
margin: 8px 0;
position: relative;
cursor: pointer;
}
.productInfo .oPhoto section::before {
content: "";
display: block;
width: 100%;
height: 100%;
background-color: rgba(255,255,255,.42);
position: absolute;
left: 0;
top: 0;
}

.productInfo .oPhoto section.on::before{
display: none;
}

.productInfo .focusPicture .oPhoto img{
width: 100%;
height: 100%;
}

.productInfo .focusPicture .prevNext{
width: 32px;
height: 32px;
position: absolute;
top: -4px;
right: 62px;
}

.productInfo .prevNext div.prev,
.productInfo .prevNext div.next{
width: 32px;
height: 32px;
-webkit-border-radius: 50%;
-moz-border-radius: 50%;
border-radius: 50%;
background-color: #fff;
position: absolute;
left: 0;
-webkit-transition: all .25s;
-moz-transition: all .25s;
transition: all .25s;
display: none;
cursor: pointer;
}
.productInfo .prevNext div.prev{
top: 0;
box-shadow: 0 -2px 4px rgba(0,0,0,.24);

}
.productInfo .prevNext div.next{
top: 336px;
box-shadow: 0 2px 4px rgba(0,0,0,.24);
}

.productInfo .prevNext div.prev:hover{
box-shadow: 2px -2px 3px rgba(0,0,0,.24);

}
.productInfo .prevNext div.next:hover{
box-shadow: -2px 2px 3px rgba(0,0,0,.24);
}

.productInfo .prevNext div.prev i,
.productInfo .prevNext div.next i{
width: 16px;
height: 16px;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
cursor: pointer;
}
.productInfo .prevNext div.prev i{
background: url(../images/arrows-icon.png) 0 -16px no-repeat;
background-size: 48px 32px;
bottom: 2px;
}

.productInfo .prevNext div.next i{
background: url(../images/arrows-icon.png) 0 0 no-repeat;
background-size: 48px 32px;
top: 2px;
}

.productInfo .prevNext div.prev:hover i,
.productInfo .prevNext div.next:hover i{
-webkit-transform: scale(1.1);
-moz-transform: scale(1.1);
transform: scale(1.1);
}

.productInfo .prevNext div.prev:hover i{
background: url(../images/arrows-icon.png) -16px -16px no-repeat;
background-size: 48px 32px;
}

.productInfo .prevNext div.next:hover i{
background: url(../images/arrows-icon.png) -16px 0px no-repeat;
background-size: 48px 32px;
}

.productInfo .prevNext div.prev:active i{
background: url(../images/arrows-icon.png) -32px -16px no-repeat;
background-size: 48px 32px;
}

.productInfo .prevNext div.next:active i{
background: url(../images/arrows-icon.png) -32px 0px no-repeat;
background-size: 48px 32px;
}

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