CSS Spite技术:也就是CSS精灵技术,实际上CSS的精灵就是图片里的一个个的图标元素,这些图标可以使按钮、标签以及logo等等。很多网站中都应用了该技术,可有效减少传输请求次数,所需要的图标汇总在一张图片中,一次下载即可整个页面应用

以下示例主要是CSS精灵技术的应用,直接Po代码:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>酷狗电台列表设计</title>
    <style>
        #frm{
            margin:0;
            padding:0;
            list-style-type: none;
            width: 500px;
            border:1px solid #000;
            overflow: hidden;
        }
        #frm *{
            margin:0;
            padding: 0;
            font-size: 12px;
        }
        #frm li{
            padding:4px 0;
            width: 47%;
            float: left;
            margin:5px 15px 5px 0;
            cursor: pointer;
        }
        #frm li span{
            color:#999;
            position: relative;
        }
        #frm li .d{
            width: 38px;
            height: 38px;
            float: left;
            margin:0px 12px 6px 0;
            background-image: url(img/spite2.jpg);
            position: relative;
        }
        #frm li .cont{
            position: relative;
            height: 37px;
            overflow: hidden;
        }
        .cont div{
            margin:5px 0 5px 0;
        }
        .d div{
            position: absolute;
            width: 100%;
            height: 100%;
        }
        .d .img,.d .play{
            background-image: url(img/spite2.jpg);
        }
        .l1 .d .img{
            background-position: 38px 0;
        }
        .l2 .d .img{
            background-position: 76px 0;
        }
        .l3 .d .img{
            background-position: 114px 0;
        }
        .l4 .d .img{
            background-position: 152px 0;
        }
        .l5 .d .img{
            background-position: 190px 0;
        }
        .l6 .d .img{
            background-position: 228px 0;
        }
        .l7 .d .img{
            background-position: 266px 0;
        }
        .l8 .d .img{
            background-position: 304px 0;
        }
        .l9 .d .img{
            background-position: 342px 0;
        }
        .ll .d .img{
            background-position: 380px 0;
        }
        .d .mask,.d .play{
            visibility: hidden;
        }
        .choose .d{
            background-position: 38px 0;
            outline: 1px solid rgb(233,243,250);
        }
        .choose .d .mask{
            background-color: #000;
            filter:alpha(Opacity=50);
            opacity: 0.5;
            height: 32px;
            width: 32px;
            top:3px;
            left: 3px;
            visibility: visible;
        }
        .choose .d .play{
            background-position: 418px 0;
            visibility: visible;
        }
        .choose .cont div{
            font-weight: bold;
            color:rgb(0,155,250);
        }
    </style>
    <script>
        function mouseoverhandle(obj){
            obj.className += ' choose';
        }
        function mouseouthandle(obj){
            obj.className = obj.className.substring(0,2);
        }
    </script>
</head>
<body>
<ul id="frm">
    <li class="l1" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>酷狗热歌</div>
            <span href="#">徐朗 - 小夜曲</span>
        </div>
    </li>
    <li class="l2" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>DJ热碟</div>
            <span href="#">曾春年 - 最幸福的人</span>
        </div>
    </li>
    <li class="l3" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>网络红歌</div>
            <span href="#">徐志强 - 想你的时候</span>
        </div>
    </li>
    <li class="l4" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>新歌</div>
            <span href="#">孙俪 - 美丽信号</span>
        </div>
    </li>
    <li class="l5" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>经典</div>
            <span href="#">游鸿明 - 寻你</span>
        </div>
    </li>
    <li class="l6" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>怀旧粤语</div>
            <span href="#">陈慧娴 - 人生何处不相逢</span>
        </div>
    </li>
    <li class="l7" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>钢琴</div>
            <span href="#">July - My Soul</span>
        </div>
    </li>
    <li class="l8" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>KTV必点</div>
            <span href="#">蔡健雅 - 无底洞</span>
        </div>
    </li>
    <li class="l9" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>思念</div>
            <span href="#">张杰 - 这就是爱</span>
        </div>
    </li>
    <li class="ll" onmouseover="mouseoverhandle(this)" onmouseout="mouseouthandle(this)">
        <div class="d">
            <div class="img"></div>
            <div class="mask"></div>
            <div class="play"></div>
        </div>
        <div class="cont">
            <div>DJ外文舞曲</div>
            <span href="#">Jean Cloud Ades</span>
        </div>
    </li>
</ul>
<script>
    var ul = document.getElementById('frm');
    var li = document.getElementsByTagName('li');
    var spans;
    for(var i=0;i<li.length;i++){
        spans = li[i].getElementsByTagName('span');
        li[i].span_obj = spans[0];
    }
    var index = -1;
    function showup(){
        if(li[index].span_obj.style.top == ''){
            li[index].span_obj.style.top = '13px';
        }
        if(parseInt(li[index].span_obj.style.top)<=0){
            li[index].span_obj.style.top = '';
            setTimeout('shownext()',1000);
        }else{
            li[index].span_obj.style.top = parseInt(li[index].span_obj.style.top)-1 +'px';
            setTimeout('showup()',100);
        }
    }
    function shownext(){
        index++;
        index = index%li.length;
        showup();
    }
    setTimeout(shownext,1000);
</script>
</body>
</html>

生成效果:

DIV+CSS实现电台列表设计的示例代码

代码分析:

1.ul标签内部含有10个li标签,因为每个li标签的图标为不同的子图片,所以给每个li标签里添加不同的class属性。

2.每个li标签的class属性为d的div标签里面包含了3个div标签,它们的class属性为img、mask和play,这三个标签依次为主题图标、遮罩图标和播放图标,而他们的父节点div(class属性为d)以背景图片作为边框。

3.每个li标签都添加了onmouseover以及onmouseout事件响应函。

4.最后面一段js代码是模拟音乐盒歌曲切换时的歌曲名上升的效果。

首先程序获取id为frm的标签,并获取该标签的所有li子标签,同时获取所有li的span标签,并绑定第一个span标签到li标签对象的span_obj上。

两个超时函数:shownext()以及showup(),其中showup()函数负责产生歌名升起效果,而函数shownext()负责切换到下一个音乐台的歌曲的播放。

对象的方法内部不可以设置自身为超时函数

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

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