<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.div1{
width: 600px;
height: 400px;
margin-bottom: 10px;
position: relative;
}
.div1 img{
width: 100%;
height: 100%;
}
.p{
width: 50px;
height: 50px;
background-color: pink;
color: blue;
position: absolute;
top: 0px;
left: 0px;
font-size: 20px;
text-align: center;
line-height: 50px;
}
input{
width: 90px;
height: 35px;
background-color: mediumspringgreen;
font-size: 18px;
border: none;
}
</style>
</head>
<body>
<div class="div1" id="div1">
<img src="img/1.png"/>
<p id="p" class="p">1</p>
</div>
<input type="button" name="btn" id="btn" value="下一张" />
<input type="button" name="btn1" id="btn1" value="上一张" />
<script type="text/javascript">
var oBtn = document.getElementById('btn');
var oBtn1 = document.getElementById('btn1');
var img = document.getElementsByTagName('img')[0];
var p = document.getElementById('p');
var i=1;
oBtn.onclick = function(){
i++;
//当i小大于7的时候
if (i>7) {
i=1;
}
img.src = "img/"+i+".png";
//把图片对应的序号放到p中
p.innerHTML = i;
}
oBtn1.onclick = function(){
i--;
//当i小于1的时候
if (i<1) {
i=7;
}
img.src = "img/"+i+".png";
//把图片对应的序号放到p中
p.innerHTML = i;
}
</script>
</body>
</html>
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