Jquery 实现banner图滚动效果

时间:2023-03-09 20:20:11
Jquery 实现banner图滚动效果

html代码:

 <div id="focus">
<ul>
<li><p>禅的修行应要无欲无求1</p><a href="http://www.jiyun360.com/topic/201405/index.aspx" target="_blank" title="浓情初夏,感恩回馈!">
<img src="data:images/shenxiao_qietu.jpg" alt="浓情初夏,感恩回馈!" /></a></li>
<li><p>禅的修行应要无欲无求2</p><a href="http://yunshi.jiyun360.com/" target="_blank" title="十二生肖马年开运宝典">
<img src="data:images/shenxiao_qietu2.jpg" alt="十二生肖马年开运宝典" /></a></li>
</ul>
</div>

jQuery代码:

/*广告图片切换*/
$(function() {
var sWidth = $("#focus").width(); //获取焦点图的宽度(显示面积)
var len = $("#focus ul li").length; //获取焦点图个数
var index = ;
var picTimer; //以下代码添加数字按钮和按钮后的半透明条,还有上一页、下一页两个按钮
var btn = "<div class='btnBg'></div><div class='btn'>";
for (var i = ; i < len; i++) {
btn += "<span></span>";
}
btn += "</div><div class='preNext pre'></div><div class='preNext next'></div>";
$("#focus").append(btn);
$("#focus .btnBg").css("opacity", 0.5); //为小按钮添加鼠标滑入事件,以显示相应的内容
$("#focus .btn span").css("opacity", 0.4).mouseenter(function() {
index = $("#focus .btn span").index(this);
showPics(index);
}).eq().trigger("mouseenter"); //上一页、下一页按钮透明度处理
$("#focus .preNext").css("opacity", 0.2).hover(function() {
$(this).stop(true, false).animate({ "opacity": "0.5" }, );
}, function() {
$(this).stop(true, false).animate({ "opacity": "0.2" }, );
}); //上一页按钮
$("#focus .pre").click(function() {
index -= ;
if (index == -) { index = len - ; }
showPics(index);
}); //下一页按钮
$("#focus .next").click(function() {
index += ;
if (index == len) { index = ; }
showPics(index);
}); //本例为左右滚动,即所有li元素都是在同一排向左浮动,所以这里需要计算出外围ul元素的宽度
$("#focus ul").css("width", sWidth * (len)); //鼠标滑上焦点图时停止自动播放,滑出时开始自动播放
$("#focus").hover(function() {
clearInterval(picTimer);
}, function() {
picTimer = setInterval(function() {
showPics(index);
index++;
if (index == len) { index = ; }
}, ); //此4000代表自动播放的间隔,单位:毫秒
}).trigger("mouseleave"); //显示图片函数,根据接收的index值显示相应的内容
function showPics(index) { //普通切换
var nowLeft = -index * sWidth; //根据index值计算ul元素的left值
$("#focus ul").stop(true, false).animate({ "left": nowLeft }, ); //通过animate()调整ul元素滚动到计算出的position
//$("#focus .btn span").removeClass("on").eq(index).addClass("on"); //为当前的按钮切换到选中的效果
$("#focus .btn span").stop(true, false).animate({ "opacity": "0.4" }, ).eq(index).stop(true, false).animate({ "opacity": "" }, ); //为当前的按钮切换到选中的效果
}
});

CSS:

/*广告图片切换*/
#focus{width:340px;height:256px;overflow:hidden;position:relative;z-index:;}
#focus ul{height:400px;position:absolute;}
#focus ul li{float:left;width:340px;height:318px;overflow:hidden; position:relative; background:#fff; }
#focus ul li p{position:absolute; top:233px; left:10px; font-size:12px; color:#ffffff; z-index:}
#focus ul li div{position:absolute; overflow:hidden;}
#focus .btnBg{position:absolute;width:800px;height:30px;left:;bottom:;background:#;}
#focus .btn{position:absolute;width:780px;height:10px;padding:10px 10px;*padding:10px 10px;right:;bottom:;text-align:right;}
#focus .btn span{display:inline-block;_display:inline;_zoom:;width:10px;height:10px;_font-size:;margin-left:5px;cursor:pointer;background:#fff;}
#focus .btn span.on{background:#fff;}
#focus .preNext{width:45px;height:100px;position:absolute;top:90px;background:url(/content/images/sprite.png) no-repeat ;cursor:pointer;}
#focus .pre{left:;}
#focus .next{right:;background-position:right top;}
#focus ul,li{list-style:none;}
#focus img{border:;}
#focus ul li{float:left;width:340px;height:256px;overflow:hidden;position:relative;background:#fff;}