原生javascript实现图片轮播切换效果
本文实例为大家分享了javascript实现图片轮播切换效果的具体代码,供大家参考,具体内容如下
效果如下:
代码部分:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> *{margin:0;padding:0;} #banner{position:relative;width:400px;height:200px;margin:50px auto;overflow: hidden;} #banner .box{width:400px;height:200px;overflow: hidden;} #banner .box li img{width:400px;height:200px;overflow: hidden;} #banner .box li{display:none;} #banner .box li.active{display:block;} #banner .static{position:absolute;bottom:0;height:30px;width:390px;padding-right:10px;text-align:right;} #banner .static span{display:inline-block;width:20px;height:20px;margin:0 2px;line-height:20px;text-align:center;background:#fff;cursor:default;} #banner .static span.active{background:blue;color:#fff;} #banner .btn{position:absolute;top:80px;height:40px;width:20px;color:#fff;line-height:40px;text-align:center;background:#000;opacity:.75;cursor:default;} #banner .next.btn{right:0;} </style> </head> <body> <div id="banner"> <div class="box"> <ul> <li class="active"> <a href="#"> <img src="img/banner.jpg"/> </a> </li> <li> <a href="#"> <img src="img/banner01.jpg"/> </a> </li> <li class=""> <a href="#"> <img src="img/banner02.jpg"/> </a> </li> <li> <a href="#"> <img src="img/banner03.jpg"/> </a> </li> </ul> </div> <div class="static"> <span class="active">1</span> <span>2</span> <span>3</span> <span>4</span> </div> <div class="prev btn"><</div> <div class="next btn">></div> </div> <script> //切换样式 function toggleClass(elem, classStr){ if(elem.className){ if(elem.className.indexOf(classStr) > -1){ elem.className = elem.className.replace(classStr,""); }else{ elem.className = elem.className + " " + classStr; } }else{ elem.className = classStr; } } //获取元素所在兄弟元素的索引 function getIndex(elem){ var index; var childNodes = elem.parentNode.childNodes; //获取子元素的元素节点 function childElem(){ var result = []; for(var i = 0, len = childNodes.length; i < len; i++){ if(childNodes[i].nodeType == 1){ result.push(childNodes[i]); } } return result; } //判断元素与子元素是否相等 var child = childElem(elem); for(var j = 0, lenj = child.length; j < len; j++){ if(child[j] == elem){ index = j; }else{ console.error("没有找到相应的子元素!"); } } //返回索引 return index; } //dom选择器 function $(selector){ return document.querySelector(selector); } function $$(selector){ return document.querySelectorAll(selector); } //对象参数 var int = { num: null, speed: null, timerId: null }; var liItem = $$("#banner .box li"); var static = $$("#banner .static span"); var btn = $$("#banner .btn"); //初始化默认值 var activeNum = 1; int.num = liItem.length; int.speed = 3000; //切换动作 function toggleItem(num){ toggleClass($("#banner .box li.active"), "active"); toggleClass($("#banner .static span.active"), "active"); //添加下一个激活选项 toggleClass(liItem.item(num), "active"); toggleClass(static.item(num), "active"); } function autoPlay(){ int.timerId = setInterval(function(){ if(activeNum < int.num){ toggleItem(activeNum); activeNum++; }else{ activeNum = 0; toggleItem(activeNum); activeNum++; } },int.speed); } //定时轮播 autoPlay(); //状态点鼠标移入移出效果 for(var i = 0, len = static.length; i < len; i++){ //匿名传参避免产生闭包得不到想要的效果 (function(j){ //鼠标移入效果 static.item(j).onmouseenter = function(){ //停止动画 clearInterval(int.timerId); var index = getIndex(this); toggleItem(index); } //鼠标移出效果 static.item(j).onmouseleave = function(){ //开始动画 autoPlay(); } })(i); } for(var k = 0, lenk = btn.length; k < lenk; k++){ //上下张按钮移入移出效果 btn.item(k).onmouseenter = function(){ clearInterval(int.timerId); } btn.item(k).onmouseleave = function(){ autoPlay(); } } //单价击上一张 $(".prev.btn").onclick = function(){ if(activeNum > 0){ activeNum--; toggleItem(activeNum); }else{ activeNum = 3; toggleItem(activeNum); } } //单击下一张 $(".next.btn").onclick = function(){ if(activeNum < int.num){ toggleItem(activeNum); activeNum++; }else{ activeNum = 0; toggleItem(activeNum); activeNum++; } } </script> </body> </html>
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