实现图片上一张和下一张的切换,带有提示项
HTML页面
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE-edge">
<meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
<link rel="stylesheet" href="/cssDocument/test.css">
<script>
window.onload = function () {
//获取两个按钮
var prev = document.getElementById("prev");
var next = document.getElementById("next");
//获取img标签
var img = document.getElementsByTagName("img")[0];
var imgArr = ["/img/1.png", "/img/2.png", "/img/3.png", "/img/4.png", "/img/5.png"]
var index = 0;
//获取id为info的元素
var info=document.getElementById("info");
//设置提示文字
info.innerHTML="一共"+imgArr.length+"张图片,当前是第"+(index+1)+"张"
//绑定点击响应函数
//上一张
prev.onclick = function () {
index--;
if (index < 0) {
index = imgArr.length-1;
}
info.innerHTML="一共"+imgArr.length+"张图片,当前是第"+(index+1)+"张"
img.src = imgArr[index];
};
//下一张
next.onclick = function () {
index++;
if (index > imgArr.length-1) {
index = 0;
}
info.innerHTML="一共"+imgArr.length+"张图片,当前是第"+(index+1)+"张"
img.src = imgArr[index];
};
};
</script>
<title>图片切换</title>
</head>
<body>
<!-- 图片摆放 -->
<div class="outer">
<p id="info">一共5张图片,当前在第1张</p>
<img src="/img/1.png" alt="">
<div class="imgButton">
<button id="prev">上一张</button>
<button id="next">下一张</button>
</div>
</div>
</body>
</html>
css文件
/* 清除样式 */
*{
margin: 0;
padding: 0;
}
/* 图片居中 */
.outer{
width: 100%;
margin: 50px auto;
padding: 10px;
background-color: bisque;
text-align: center;
}
结果显示:到最后一张时,点击下一张会回到第一张
在第一张时,点击上一张会跳转到最后一张