JS实现banner图轮换
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方法一：
<!--灰色背景代码替换图片-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div>
<div>
<img src="../img/110.jpg" width="970" height="280" id="img" />
</div>
</div>
<script type="text/javascript">
var curIndex=0;
var arr=new Array();
arr[0]="../img/111.jpg";
arr[1]="../img/112.jpg";
arr[2]="../img/110.jpg";
setInterval(function(){
var img=document.getElementById("img");
if (curIndex==arr.length-1) {
curIndex=0;
} else {
curIndex+=1;
}
img.src=arr[curIndex];
} ,3000);
</script>
</body>
</html>
方法二：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
padding: 0px;
margin: 0px;
}
#banner{
width: 100%;
overflow: hidden;
white-space: nowrap;
position: relative;
}
#banner #inside{
width: 9600px;
position: relative;
left: 50%;
margin-left: -960px;
transition: all 1s ease;
}
#banner img{
width: 1920px;
}
#bannerNum{
padding: 0px;
list-style: none;
overflow: hidden;
width: 160px;
position: absolute;
bottom: 30px;
right: 50px;
}
#bannerNum li{
width: 30px;
height: 30px;
background-color: white;
text-align: center;
line-height: 30px;
margin: 0px 5px;
float: left;
cursor: pointer;
}
</style>
<script>
var num = 1;
var inside;
window.onload = function(){
inside = document.getElementById("inside");
var interval = setInterval(function(){
inside.style.transition = "all 1s ease";
num++;
switch (num){
case 1:
inside.style.transition = "none";
inside.style.marginLeft = (-960)+"px";
break;
case 2:
inside.style.marginLeft = (-960-1920)+"px";
break;
case 3:
inside.style.marginLeft = (-960-1920*2)+"px";
break;
case 4:
inside.style.marginLeft = (-960-1920*3)+"px";
break;
case 5:
inside.style.marginLeft = (-960-1920*4)+"px";
num = 0;
break;
default:
break;
}
},2000);
}
function changeBanner(num1){
inside.style.transition = "none";
switch (num1){
case 1:
inside.style.marginLeft = (-960)+"px";
break;
case 2:
inside.style.marginLeft = (-960-1920)+"px";
break;
case 3:
inside.style.marginLeft = (-960-1920*2)+"px";
break;
case 4:
inside.style.marginLeft = (-960-1920*3)+"px";
break;
default:
break;
}
num = num1-1;
}
</script>
</head>
<body>
<div id="banner">
<div id="inside"><img src="../img/110.jpg" id="img1" /><img src="../img/111.jpg" id="img2" /><img src="../img/112.jpg" id="img3" /><img src="../img/111.jpg" id="img4" /><img src="../img/110.jpg" id="img5" />
</div>
<ul id="bannerNum">
<li onclick="changeBanner(1)">1</li>
<li onclick="changeBanner(2)">2</li>
<li onclick="changeBanner(3)">3</li>
<li onclick="changeBanner(4)">4</li>
</ul>
</div>
</body>
</html>
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