原生JS实现幻灯片
时间：2021-10-30 10:33:00|栏目：JavaScript代码|点击： 次
效果如下：
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style type = "text/css">
*{ padding: 0; margin: 0; }
li { list-style: none; }
.box {
width: 800px;
height: 450px;
margin: 50px auto;
position: relative;
overflow:hidden;
}
.box span {
width: 40px;
height: 60px;
display: block;
position: absolute;
top: 225px;
margin-top: -20px;
cursor: pointer;
z-index: 1;
}
.box #left {
width: 76px;
height: 112px;
background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat left 0;
left: 0;
margin-top: -66px;
display: none;
}
.box #right {
width: 76px;
height: 112px;
background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat right 0;
right: 0;
margin-top: -66px;
display: none;
}
.box #txt {
width: 100%;
height: 30px;
background-color: #000;
opacity: 0.4;
position: absolute;
bottom: 0;
color: #fff;
line-height: 30px;
text-align: center;
}
#ad {
width: 4000px;
height: 450px;
position: absolute;
left: -1600px;
}
#ad li {
float: left;
}
.box #left:hover {
background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat left -112px;
}
.box #right:hover {
background: url('http://www.w2bc.com/upload/201609/20/jiaoben4524/images/buttons.png') no-repeat right -112px;
}
</style>
<script type = "text/javascript">
window.onload = function(){
function $(id){ return document.getElementById(id);}
var aLi = $("ad").children;
function animate(obj,target,arrt){
//关闭上一个定时器
clearInterval(obj.timer);
$("txt").innerHTML = obj.children[0].children[0].alt;
//管理定时器
obj.timer = setInterval(function(){
//移动步长
var step = (target - obj.offsetLeft) / 10;
//步长取整
step = step > 0? Math.ceil(step):Math.floor(step);
//移动盒子 ： 盒子位置 + 步长
obj.style.left = obj.offsetLeft + step+ "px";
//关闭定时器
if(obj.offsetLeft%800 ==0){
clearInterval(obj.timer);
//判断点击的方向
if(arrt === "left"){
var oLi = $("ad").children[aLi.length - 1].cloneNode(true);
//添加到最前面
obj.insertBefore(oLi,obj.children[0]);
//删除最后一个盒子
obj.removeChild(obj.children[aLi.length - 1]);
//让ul恢复初始值
obj.style.left = "-1600px";
}else{
//克隆第一个盒子
var oLi = obj.children[0].cloneNode(true);
//添加到最后面
obj.appendChild(oLi);
//删除第一个盒子
obj.removeChild(obj.children[0]);
//让ul恢复初始值
obj.style.left = "-1600px";
}
}
},20);
}
var timer = setInterval(autoplay,2000);
function autoplay(){
animate($("ad"),-2400,"right");
}
$("ad").parentNode.onmouseover = function(){
clearInterval(timer);
$("left").style.display = "block";
$("right").style.display = "block";
}
$("ad").parentNode.onmouseout = function(){
$("left").style.display = "none";
$("right").style.display = "none";
timer = setInterval(autoplay,2000);
}
$("left").onclick = function(){
clearInterval(timer);
animate($("ad"),-800,"left");
}
$("right").onclick = function(){
clearInterval(timer);
animate($("ad"),-2400,"right");
}
}
</script>
</head>
<body>
<div class="box">
<ul id="ad">
<li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/4.jpg" alt="闲静似娇花照水，行动如弱柳扶风。"></li>
<li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/5.jpg" alt="心较比干多一窍，病如西子胜三分。"></li>
<li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/1.jpg" alt="两弯似蹙非蹙笼烟眉，一双似喜非喜含情目。"></li>
<li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/2.jpg" alt="态生两靥之愁，娇袭一身之病。"></li>
<li><img src="http://www.w2bc.com/upload/201609/20/jiaoben4524/images/3.jpg" alt="泪光点点，娇喘微微。"></li>
</ul>
<p id="txt">泪光点点，娇喘微微</p>
<span id="left"></span>
<span id="right"></span>
</div>
</body>
</html>
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本文标题：原生JS实现幻灯片
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