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Js图片切换
<!DOCTYPE html><html<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="http://www.mamicode.com/css/1.css" />
<style>
在css中，因为p标签有个margin ,所以margin 要置为0，filter:alpha(opacity:80)（兼容IE浏览器）; opacity:0.8(兼容火狐浏览器);
p { margin:0; }
body { text-align:center; }
#box { width:400px; height:400px; border:10px solid #ccc; margin:50px auto 0; position:relative; }
a { width:40px; height:40px; background:brown; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:160px; font-size:18px; color:#000; text-align:center; line-height:40px; text-decoration:none; }
a:hover { filter:alpha(opacity:30); opacity:0.3; }
#prev { left:10px; }
#next { right:10px; }
#p1 { width:400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; bottom:0; left:0; }
strong { width:400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:0; left:0; }
#img1 { width:400px; height:400px; }
span { position:absolute; width:400px; height:30px; line-height:30px; text-align:center; top:-50px; left:0; font-family:‘微软雅黑‘; }
</style>
<script type="text/javascript" >
window.onload = function (){
var oPrev = document.getElementById(‘prev‘);
var oNext = document.getElementById(‘next‘);
var oP = document.getElementById(‘p1‘);
var oStrong = document.getElementById(‘strong1‘);
var oImg = document.getElementById(‘img1‘);
var aBtn = document.getElementsByTagName(‘input‘);
var arrUrl = [ ‘img/1.jpg‘, ‘img/2.jpg‘, ‘img/3.jpg‘, ‘img/4.jpg‘ ];
var arrText = [ ‘文字一‘, ‘文字二‘, ‘文字三‘, ‘识文断字‘ ];
var num = 0;
var onOff = true;
//初始化
function Tab(){
oStrong.innerHTML=num+1+"/"+arrText.length;
oP.innerHTML=arrText[num];
oImg.src=http://www.mamicode.com/arrUrl[num];
}
Tab();
aBtn[0].onclick=function(){
onOff=true;
document.getElementsByTagName("span")[0].innerHTML=‘图片可从最后一张跳转到第一张循环切换‘;
};
aBtn[1].onclick=function(){
onOff=false;
document.getElementsByTagName("span")[0].innerHTML=‘图片只能到最后一张或只能到第一张切换‘;
};
oNext.onclick=function(){
num++;
if(onOff){
if(num==arrText.length){num=0; }
}else{
if(num==arrText.length){alert("这已经是最后一张~~~~~");
num=arrText.length-1;
}
}
Tab();
};
oPrev.onclick=function(){
num--;
if(onOff){
if(num==-1){num=arrText.length-1;}
}else{
if(num==-1){num=num+1;
alert(‘这已经是第一张了~~~~‘);}
}
Tab();
}
}
</script>
</head>
<body>
<input type="button" value="http://www.mamicode.com/循环切换" />
<input type="button" value="http://www.mamicode.com/顺序切换" />
<div id="box"><span>图片可从最后一张跳转到第一张循环切换</span>
<a id="prev" href="javascript:;"><</a>
<a id="next" href="javascript:;">></a>
<p id="p1">图片文字加载中……</p>
<strong id="strong1">图片数量计算中……</strong>
<img id="img1" />
</div>
</body>
</html>
Js图片切换