js 图片切换思路参考

来源：互联网发布：遗传算法的基本原理ppt 编辑：程序博客网时间：2024/05/18 12:01

<!DOCTYPE html><html><head lang="en">    <meta charset="UTF-8">    <title>切换</title>    <script type="text/javascript" src="../lib/jquery-2.1.3.min.js"></script>    <style type="text/css">        * {margin:0; padding:0;}        body {font-size:12px; color:#222; font-family:Verdana,Arial,Helvetica,sans-serif; background:#f0f0f0;}        .clearfix:after {content: "."; display: block; height: 0; clear: both; visibility: hidden;}        .clearfix {zoom:1;}        ul,li {list-style:none;}        img {border:0;}        .wrapper {width:800px; margin:0 auto; padding-bottom:50px;}        /* qqshop focus */        #focus {width:800px; height:280px; overflow:hidden; position:relative;}        #focus ul {height:380px; position:absolute;}        #focus ul li {float:left; width:800px; height:280px; overflow:hidden; position:relative; background:#000;}        #focus ul li div {position:absolute; overflow:hidden;}        #focus .btnBg {position:absolute; width:800px; height:20px; left:0; bottom:0; background:#000;}        #focus .btn {position:absolute; width:780px; height:10px; padding:5px 10px; right:0; bottom:0; text-align:right;}        /*右下角小方块*/        #focus .btn span {display:inline-block; _display:inline; _zoom:1; width:25px; height:10px; _font-size:0; 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(../images/sprite.png) no-repeat 0 0; cursor:pointer;}        #focus .pre {left:0;}        #focus .next {right:0; background-position:right top;}    </style>

//JS部分

    <script type="text/javascript">        $(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 = 0;            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=0; 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(0).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"},300);            },function() {                $(this).stop(true,false).animate({"opacity":"0.2"},300);            });//上一页按钮            $("#focus .pre").click(function() {                index -= 1;                if(index == -1) {index = len - 1;}                showPics(index);            });//下一页按钮            $("#focus .next").click(function() {                index += 1;                if(index == len) {index = 0;}                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 = 0;}                },4000); //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                $("#focus ul").stop(true,false).animate({"left":nowLeft},300); //通过animate()调整ul元素滚动到计算出的position//$("#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"},300).eq(index).stop(true,false).animate({"opacity":"1"},300); //为当前的按钮切换到选中的效果            }        });    </script>

</head><body><div class="wrapper">    <div id="focus">        <ul>            <li><a href="#" target="_blank"><img src="../images/11.png" alt="QQ商城焦点图效果下载"/></a></li>            <li><a href="#" target="_blank"><img src="../images/22.png" alt="QQ商城焦点图效果教程"/></a></li>            <li><a href="#" target="_blank"><img src="../images/33.png" alt="jquery商城焦点图效果"/></a></li>        </ul>    </div></div></body></html>

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js 图片切换 思路参考

js 图片切换思路参考