一、实现效果图
二、分析布局
主盒子里分上下两个小盒子（1和2）。
包含图片的盒子占两张图片的宽（3），处于上盒子中，当前图片在上盒子（1）中，其它图片在盒子（3）的右侧等待播放。
下边的盒子（2）包括了六个小方块及定位在主盒子上的两个箭头。
三、html部分
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>wangyi</title>
<link type="text/css" href="https://www.jb51.net/css/guide.css"/>
<script type="text/javascript" src="https://www.jb51.net/animate.js"></script>
<script type="text/javascript" src="https://www.jb51.net/js/main.js"></script>
</head>
<body>
<div>
<div>
<div>
<div><a href="#"><img src="https://www.jb51.net/images/1.jpg"/></a></div>
<div><a href="#"><img src="https://www.jb51.net/images/2.jpg"/></a></div>
<div><a href="#"><img src="https://www.jb51.net/images/3.jpg"/></a></div>
<div><a href="#"><img src="https://www.jb51.net/images/4.jpg"/></a></div>
<div><a href="#"><img src="https://www.jb51.net/images/5.jpg"/></a></div>
<div><a href="#"><img src="https://www.jb51.net/images/6.jpg"/></a></div>
</div>
</div>
<div>
<span></span>
<span></span>
</div>
</div>
</body>
</html>
四、CSS部分
* { margin: 0; padding: 0; } .w-slider { width:310px; height:265px; margin:100px auto; overflow: hidden; position: relative; } .slider { width:310px; height:220px; } .slider-main { width:620px; height:220px; } .slider-main-img{ width:310px; height:220px; position:absolute; top:0; left:0; } .slider-main-img img{ vertical-align: top; } .slider-ctrl { width:310px; height:45px; text-align:center; } .slider-ctrl span { cursor: pointer; } .slider-ctrl-con { display:inline-block; width:24px; height:20px; margin-right:8px; text-indent: -20em; overflow:hidden; background:url(../images/icon.png)-24px -782px no-repeat; } .slider-ctrl .current { background:url(../images/icon.png)-24px -762px no-repeat; } .slider-ctrl-pre, .slider-ctrl-next { width:27px; height:38px; position:absolute; top:50%; margin-top:-36px; opacity:0.7; filter:alpha(opacity=50); } .slider-ctrl-pre { background:url(../images/icon.png)6px 1px no-repeat; left:0; } .slider-ctrl-next { background:url(../images/icon.png)-9px -44px no-repeat; right:0; }
五、JS部
/** * Created by 15623544233 on 2016/10/17. */ window.onload=function () { //imgs的DOM对象 var slider_main_block =$("slider_main_block"); var sliderImgs =slider_main_block.children; //最外层的slider大盒子 var sider_box =slider_main_block.parentNode.parentNode; //slider-ctrl的DOM对象 var slider_ctrl = $("slider_ctrl"); var sliderCtrls =slider_ctrl.children; //动态添加Ctrl for(var i=0;i<sliderImgs.length;i++){ var spans = document.createElement("span"); spans.className="slider-ctrl-con"; //span中的数字为当前的索引，后面有重要作用 spans.innerHTML =sliderImgs.length-i; slider_ctrl.insertBefore(spans,sliderCtrls[1]); } sliderCtrls[1].setAttribute("class","current slider-ctrl-con"); //imgW ---图片宽 var imgW = sliderImgs[0].clientWidth; //让除第一张图以外的所有图右移 for(var i=1;i<sliderImgs.length;i++){ sliderImgs[i].style.left=imgW+"px"; } //至关重要的标志位，currentId 当前出现的盒子 var currentId = 0; for(var key in sliderCtrls){ sliderCtrls[key].onclick =function () { //左箭头点击的运动动画 if(this.className=="slider-ctrl-pre"){ //与左移动参数相反 animate(sliderImgs[currentId],{left:imgW}); --currentId<0?currentId=sliderImgs.length-1:currentId; sliderImgs[currentId].style.left=-imgW+"px"; animate(sliderImgs[currentId],{left:0}); //右箭头的运动动画，与自动轮播的运动动画一致 }else if(this.className=="slider-ctrl-next"){ autoPlay(); }else{ //得到当前要点击的图片索引号 var that = this.innerHTML-1; if(that>currentId){ //像点击右侧按钮一样播放 animate(sliderImgs[currentId],{left:-imgW}); sliderImgs[that].style.left=imgW+"px"; }else if(that<currentId){ animate(sliderImgs[currentId],{left:imgW}); sliderImgs[that].style.left=-imgW+"px"; } /*当点击按钮后，当前图片currentId移动后，所点击的盒子成为当前的图片，使图片连续*/ currentId =that; animate(sliderImgs[currentId],{left:0}); } flashCurrent((currentId+1)); }; } //小方块控制slider动画的函数 function flashCurrent(index) { //console.log(index); for(var i=1;i<sliderCtrls.length-1;i++){ sliderCtrls[i].setAttribute("class","slider-ctrl-con"); } sliderCtrls[index].setAttribute("class","current slider-ctrl-con"); } //添加定时器 var timer =null; timer =setInterval(autoPlay,2000); function autoPlay() { animate(sliderImgs[currentId],{left:-imgW}); //当第6张左移走后，6>5,第0张回到框中 ++currentId>sliderImgs.length-1?currentId = 0:currentId; //上一张图片左移后，下一张图片快速到右边 sliderImgs[currentId].style.left=imgW+"px"; //下张右侧图片左移 animate(sliderImgs[currentId],{left:0}); } sider_box.onmouseover =function () { clearInterval(timer); } sider_box.onmouseout=function () { timer =setInterval(autoPlay,2000); } }; function $(id) { return document.getElementById(id); } /*当前样式属性值的获取 */ function curStyle(obj,attr){ if(obj.currentStyle){ //IE浏览器 return obj.currentStyle[attr]; }else{ //标准浏览器 return window.getComputedStyle(obj,null)[attr]; } } /*封装的运动框架*/ /*obj ----做动画的DOM对象 ；json----变化的部分是json数据 */ function animate(obj,json) { //调用时先清定时器 clearInterval(obj.timer); //定时器为obj的内部定时器，不用每次调用都创建一个新的定时器 obj.timer = setInterval(function () { //遍历json数据，每次遍历的标志位为flag var flag=true; //遍历json数据，eg:{left:20,top:40,opacity:50,z-index:3} for(var key in json){ //取得盒子运动当前的位置 var current= 0; if(key=="opacity"){ //Ie6,7,8没有设置透明度，默认为undefined current =Math.round(parseInt(curStyle(obj,key)*100))||1; //console.log(current); }else{ current= parseInt(curStyle(obj,key)); } //运动步长：（目标位置-当前位置）/10 var step = (json[key]-current)/10; step = step>0?Math.ceil(step):Math.floor(step); //各属性值的渐变动画 if(key=="opacity"){ if("opacity" in obj.style){ obj.style.opacity = (current+step)/100; }else{ //兼容ie6，7，8 obj.style.filter ="alpha(opacity ="+(current+step)*10+")"; } }else if(key=="zIndex"){ obj.style[key] =json[key]; }else { obj.style[key] = current+step+"px"; } //遍历每个属性时都判断标志位 if(current!=json[key]){ flag =false; } }遍历结束后，标志位都为true,判断起所有动画执行完毕，清除定时器 if(flag){ clearInterval(obj.timer); } },20) }
精彩专题分享：