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
<div> <section> <img src="https://www.jb51.net/images/20161021/b_5809b93b66d18.jpg"/> </section><!-- 主要的大图 --> <section> <div> <section> <img src="https://www.jb51.net/images/20161021/b_5809b93b66d18.jpg"/> </section> <section> <img src="https://www.jb51.net/images/20161021/b_5809b96c4da53.jpg"/> </section> <section> <img src="https://www.jb51.net/images/20161021/b_5809b9bea39c4.jpg"/> </section> <section> <img src="https://www.jb51.net/images/20161021/b_5809ba288384e.jpg"/> </section> <section> <img src="https://www.jb51.net/images/20161021/b_5809bae42fa81.jpg"/> </section> <section> <img src="https://www.jb51.net/images/20161021/b_5809ba288384e.jpg"/> </section> <section> <img src="https://www.jb51.net/images/20161021/b_5809bb3da0bbc.jpg"/> </section> </div> </section><!-- 其他的小图 --> <section> <div> <i></i> </div><!-- 上一张 --> <div> <i></i> </div><!-- 下一张 --> </section><!-- 上下翻页 --> </div><!-- 焦点图区 -->
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; }