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焦点图左右按钮、下标显示、自动轮播

2018-06-22 11:00 134 查看 
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>焦点图左右按钮、下标显示、自动轮播</title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
img{
vertical-align: top;
}
li{
list-style: none;
}
#focus-banner{
position: relative;
width: 100%;
overflow: hidden;
}

#focus-banner-list{
position: relative;
}
#focus-banner-list li{
position: absolute;
left: 0;
top: 0;
width: 100%;
}
#focus-banner-list li img{
width: 100%;
}
.focus-banner-img{
display: block;
}
#focus-banner .focus-handle{
position: absolute;
top: 50%;
margin-top: -40px;
z-index: 100;
display: block;
width: 80px;
height: 80px;
background-image: url("../images/focus_handle.png");
}
#next-img{
left: 0;
}
#next-img{
left: 50px;
background-position: 0 0;
}
#next-img:hover{
background-position: 0 -80px;
}
#prev-img{
right: 0;
}
#prev-img{
right: 50px;
background-position: -80px 0;
}
#prev-img:hover{
background-position: -80px -80px;
}

#focus-bubble{
position: absolute;
left: 50%;
bottom: 10px;
z-index: 999;
}
#focus-bubble li{
float: left;
width: 10px;
height: 10px;
margin: 0 5px;
border-radius: 50%;
-webkit-border-radius: 50%;
-moz-border-radius: 50%;
-o-border-radius: 50%;
-ms-border-radius: 50%;
border:1px #fff solid;
cursor: pointer;
}
#focus-bubble li a{
display: block;
width: 100%;
height: 100%;
filter:alpha(opacity=0);
opacity: 0;
}
#focus-bubble li.current{
background-color: #fff;
}
</style>
</head>
<body>
<div id="focus-banner">
<ul id="focus-banner-list">
<li> <a href="#" class="focus-banner-img"> <img src="images/banner2.png" alt=""> </a>
</li>
<li> <a href="#" class="focus-banner-img"> <img src="images/banner3.png" alt=""> </a>
</li>
<li> <a href="#" class="focus-banner-img"> <img src="images/banner4.png" alt=""> </a>
</li>
<li> <a href="#" class="focus-banner-img"> <img src="images/banner5.png" alt=""> </a>
</li>
</ul>
<a href="javascript:;" id="next-img" class="focus-handle"></a> <a href="javascript:;" id="prev-img" class="focus-handle"></a>
<ul id="focus-bubble">
</ul>
</div>
<script src="js/jquery-1.10.1.min.js"></script>
<script>
$(function(){
var focusBanner=function(){
var $focusBanner=$("#focus-banner"),
$bannerList=$("#focus-banner-list li"),
$focusHandle=$(".focus-handle"),
$bannerImg=$(".focus-banner-img"),
$nextBnt=$("#next-img"),
$prevBnt=$("#prev-img"),
$focusBubble=$("#focus-bubble"),
bannerLength=$bannerList.length,
_index=0,
_timer="";

var _height=$(".focus-banner-img").find("img").height();
$focusBanner.height(_height);
$bannerImg.height(_height);

for(var i=0; i<bannerLength; i++){
$bannerList.eq(i).css("zIndex",bannerLength-i);
$focusBubble.append('<li><a href="javascript:;">'+i+'</a></li>');
}
$focusBubble.find("li").eq(0).addClass("current");
var bubbleLength=$focusBubble.find("li").length;
$focusBubble.css({
"width":bubbleLength*22,
"marginLeft":-bubbleLength*11
});//初始化

$focusBubble.on("click","li",function(){
$(this).addClass("current").siblings().removeClass("current");
_index=$(this).index();
changeImg(_index);
});//点击轮换

$prevBnt.on("click",function(){
_index++
if(_index>bannerLength-1){
_index=0;
}
changeImg(_index);
});//下一张

$nextBnt.on("click",function(){
_index--
if(_index<0){
_index=bannerLength-1;
}
changeImg(_index);
});//上一张

function changeImg(_index){
$bannerList.eq(_index).fadeIn(250);
$bannerList.eq(_index).siblings().fadeOut(200);
$focusBubble.find("li").removeClass("current");
$focusBubble.find("li").eq(_index).addClass("current");
clearInterval(_timer);
_timer=setInterval(function(){$prevBnt.click()},5000)
}//切换主函数
_timer=setInterval(function(){$prevBnt.click()},5000);

function isIE() { //ie?
if (!!window.ActiveXObject || "ActiveXObject" in window)
return true;
else
return false;
}

if(!isIE()){
$(window).resize(function(){
window.location.reload();
});
}else{
if(!+'\v1' && !'1'[0]){
alert("ie8以下版本啊！")
} else{
$(window).resize(function(){
window.location.reload();
});
};
}
}();
})
</script>
</body>
</html>

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