<!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>
.cont{width:1000px;height:260px;margin: 20px auto;position: relative;overflow: hidden;}
.imgbox{position: absolute;left:0;top:0;}
/* 1.将所有图片排成一行 */
.imgbox a{float:left;width:1000px;height:260px;overflow: hidden;}
.imgbox img{width:1000px;height:260px;}
.imgbox a:nth-child(1){z-index: 1;}
.btns{}
.btns input{width:40px;height:40px;border: none;background: rgba(200,200,200,0.4);position: absolute;top:110px;z-index: 999999;}
.left{left:0;}
.right{right:0;}
</style>
</head>
<body>
<div class="cont">
<div class="imgbox">
<a href=""><img src="img/1.jpg" alt=""></a>
<a href=""><img src="img/2.jpg" alt=""></a>
<a href=""><img src="img/3.jpg" alt=""></a>
<a href=""><img src="img/4.jpg" alt=""></a>
<!-- 2.复制第一张图，放在最后一张图的后面，用来过渡 -->
<a href=""><img src="img/1.jpg" alt=""></a>
</div>
<div class="btns">
<input type="button" class="left" value="<<<">
<input type="button" class="right" value=">>>">
</div>
</div>
</body>
<script src="../move.js"></script>
<script>
function Banner(){
this.imgbox = document.querySelector(".imgbox")
this.img = this.imgbox.children;
this.left = document.querySelector(".left")
this.right = document.querySelector(".right")
this.index = 0;
this.init();
this.addEvent();
}
Banner.prototype.init = function(){
this.imgbox.style.width = this.img.length * this.img[0].offsetWidth + "px";
}
Banner.prototype.addEvent = function(){
var that = this;
this.left.onclick = function(){
that.changeIndex(1);
}
this.right.onclick = function(){
that.changeIndex(-1);
}
}
Banner.prototype.changeIndex = function(type){
if(type == 1){
if(this.index == 0){
// 3-1.将索引设置成本来要显示的图片的索引
this.index = this.img.length-2;
// 4-1.将大长条设置下一轮播放的默认位置
this.imgbox.style.left = -(this.img.length-1) * this.img[0].offsetWidth + "px";
}else{
this.index--;
}
}else{
if(this.index == this.img.length-1){
// 3-2.将索引设置成本来要显示的图片的索引
this.index = 1;
// 4-2.将大长条设置下一轮播放的默认位置
this.imgbox.style.left = 0;
}else{
this.index++;
}
}
this.move();
}
Banner.prototype.move = function(){
// console.log(this.index)
move(this.imgbox,{left:-this.img[0].offsetWidth*this.index});
}
new Banner();
