效果
源码
<!DOCTYPE html>
<html>
<!--JQuery在线引用-->
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
#lv {
margin: 0 auto;
width: 1000px;
height: 800px;
background: rgb(150, 235, 180);
text-align: center;
}
#img{
width: 900px;
height: 600px;
margin-top: 60px;
}
#pre{
position: absolute;
right: 51%;
}
#next{
position: absolute;
right: 44%;
}
#info{
font-size: x-large;
padding-top: 30px;
}
</style>
</head>
<body>
<div id="lv">
<p id="info"></p>
<img id ='img' class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="" alt="" />
<button id="pre">上一张</button>
<button id="next">下一张</button>
</div>
</body>
<script type="text/javascript">
$(function(){
//获取两个按钮
var pre = document.getElementById("pre");
var next = document.getElementById("next");
//要切换图片就是要修改img 标签的src属性
//获取img 标签，但是返回的是数组，所以你得操作的是数组中的对象
var img = document.getElementsByTagName("img")[0];
//创建一个数组用来保存图片的路径
var imgArr = ["https://picgo-1253652709.cos.ap-guangzhou.myqcloud.com/560-300.jpg", "https://picgo-1253652709.cos.ap-guangzhou.myqcloud.com/0537AFF0-55BA-4826-9192-BAA8813F0CA7_1_105_c.jpeg", "https://picgo-1253652709.cos.ap-guangzhou.myqcloud.com/615A8F91-1822-445F-903E-5A87FA369977.jpeg"];
var index = 0;
var info = document.getElementById("info");
img.src = imgArr[0];
info.innerHTML = "总共" + imgArr.length + "照片，现在是第" + (index + 1) + "照片";
pre.onclick = function () {
if (--index < 0) {
index = imgArr.length - 1;
}
img.src = imgArr[index];
info.innerHTML = "总共" + imgArr.length + "照片，现在是第" + (index + 1) + "照片";
};
next.onclick = function () {
if (++index > imgArr.length - 1) {
index = 0;
}
img.src = imgArr[index];
info.innerHTML = "总共" + imgArr.length + "照片，现在是" + (index + 1) + "照片";
};
})
</script>
</html>
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