原生js实现网易轮播图效果

时间:2021-05-25

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" rel="stylesheet" href="css/guide.css"/> <script type="text/javascript" src="../animate.js"></script> <script type="text/javascript" src="js/main.js"></script></head><body> <div class="w-slider"> <div class="slider"> <div class="slider-main" id="slider_main_block"> <div class="slider-main-img"><a href="#"><img src="images/1.jpg"/></a></div> <div class="slider-main-img"><a href="#"><img src="images/2.jpg"/></a></div> <div class="slider-main-img"><a href="#"><img src="images/3.jpg"/></a></div> <div class="slider-main-img"><a href="#"><img src="images/4.jpg"/></a></div> <div class="slider-main-img"><a href="#"><img src="images/5.jpg"/></a></div> <div class="slider-main-img"><a href="#"><img src="images/6.jpg"/></a></div> </div> </div> <div class="slider-ctrl" id="slider_ctrl"> <span class="slider-ctrl-pre"></span> <span class="slider-ctrl-next"></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"; } 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);} 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]; }} 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:jQuery图片轮播 JavaScript图片轮播 Bootstrap图片轮播

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