JQ 自适应的焦点图

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1, user-scalable=no">
<title>焦点图</title>
<style>
* {
	padding: 0;
	margin: 0;
}
img {
	vertical-align: top;
	border: 0;
}
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-list .focus-banner-text {
	position: absolute;
	left: 50%;
	top: 0;
	width: 1000px;
	height: 100%;
	margin-left: -500px;
	text-align: center;
	color: #fff;
	font-size: 16px;
	text-align: center;
}
#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.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.jpg" alt="">
            </a>
            <div class="focus-banner-text">
                <p>这是一句广告语</p>					
            </div>
        </li>
        <li>
            <a href="#" class="focus-banner-img">
                <img src="images/banner3.jpg" alt="">
            </a>
            <div class="focus-banner-text">
                <p>这是二句广告语</p>
            </div>
        </li>
        <li>
            <a href="#" class="focus-banner-img">
                <img src="images/banner4.jpg" alt="">
            </a>
            <div class="focus-banner-text">
                <p>这是三句广告语</p>
            </div>
        </li>
        <li>
            <a href="#" class="focus-banner-img">
                <img src="images/banner5.jpg" alt="">
            </a>
            <div class="focus-banner-text">
                <p>这是四句广告语</p>
            </div>
        </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);
		$(window).resize(function(){
			window.location.reload()
		});
		for(var i=0; i<bannerLength; i++){
			$bannerList.eq(i).css("zIndex",bannerLength-i);
			$focusBubble.append("<li></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

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

		$prevBnt.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");
			$focusBubble.find("li").eq(_index).addClass("current");
			clearInterval(_timer);
			_timer=setInterval(function(){$nextBnt.click()},5000)
		}//切换主函数
		_timer=setInterval(function(){$nextBnt.click()},5000)
	}();
})
</script>
</body>
</html>
效果图：
JQ 自适应的焦点图

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