用JS实现图片切换
效果图
代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片切换</title>
<style type="text/css">
*{
margin: 0px;
padding:0px;
}
#outer{
width: 500px;
margin: 50px auto;
padding:10px;
background-color: pink;
/*设置文本居中*/
text-align: center;
}
</style>
<script type="text/javascript">
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];
//创建一个数组,保存当前图片的路径
var imgArr = ["img/1.jpg", "img/2.jpg", "img/3.jpg", "img/4.jpg", "img/5.jpg"];
//创建一个变量,保存当前正在显示图片的索引
var index = 0;
//获取id为info的p元素
var info = document.getElementById("info");
//设置提示文字
info.innerHTML = "一共 "+imgArr.length+" 张图片,当前第 "+(index+1)+" 张";
//为两个按钮绑定单击响应函数
prev.onclick = function(){
index--;
if(index<0){
index = imgArr.length-1;
}
img.src = imgArr[index];
info.innerHTML = "一共 "+imgArr.length+" 张图片,当前第 "+(index+1)+" 张";
}
next.onclick = function(){
index++;
if(index > imgArr.length - 1){
index = 0;
}
img.src = imgArr[index];
info.innerHTML = "一共 "+imgArr.length+" 张图片,当前第 "+(index+1)+" 张";
}
}
</script>
</head>
<body>
<div id="outer">
<p id="info"></p>
<img src="img/1.jpg" alt="冰棍">
<button id="prev">上一张</button>
<button id="next">下一张</button>
</div>
</body>
</html>