css3实现鼠标跟随导航效果

效果知识点：html/css布局思维, p+css讲解，css3动画，盒子模型, 浮动与定位，鼠标事件。

html代码：

<p class="wrap">
            <ul>
                <li style="background-position:0px 0px; border-top:1px dotted #ccc;border-left:1px dotted #ccc;"></li>
                <li style="background-position:-230px 0px; border-top:1px dotted #ccc"></li>
                <li style="background-position:-460px 0px; border-top:1px dotted #ccc"></li>
                <li style="background-position:-690px 0px; border-top:1px dotted #ccc"></li>
                <li style="background-position:-920px 0px; border-top:1px dotted #ccc"></li>
                <li style="background-position:-1150px 0px;border-left:1px dotted #ccc;"></li>
                <li style="background-position:-1370px 0px"></li>
                <li style="background-position:-1600px 0px"></li>
                <li style="background-position:-1830px 0px"></li>
                <li style="background-position:-2060px 0px"></li>
                <li style="background-position:-2290px 0px;border-left:1px dotted #ccc;"></li>
                <li style="background-position:-2520px 0px"></li>
                <li style="background-position:-2750px 0px"></li>
                <li style="background-position:-2980px 0px"></li>
                <li style="background-position:-3210px 0px"></li>
            </ul>
            <p class="box"></p>

css代码：

        <style>
            *{
                margin:0px;
                padding:0px;
            }
            html{
                height:100%;
            }
            body{
                width:100%;
                height:100%;
                background:url("images/wallpaper4.jpg");
                background-size:100% 100%;
                overflow: hidden;
            }
            .wrap{
                position:relative;
                width:1156px;
                height:450px;
                margin:50px auto;
            }
            .wrap ul li{
                position:relative;
                z-index:10;
                width:230px;
                height:150px;
                float:left;
                list-style:none;
                border-right:1px dotted #ccc;
                border-bottom:1px dotted #ccc;
                background:url("images/clients.png") no-repeat;
                -webkit-transition:1s;
                -moz-transition:1s;
                -ms-transition:1s;
                -o-transition:1s;
                transition:1s;
            }
            .box{
                position:absolute;
                left:0px;
                top:0px;
                z-index:2;
                width:230px;
                height:150px;
                background:rgba(0,0,0,.2);
                -webkit-transition:1s;
                -moz-transition:1s;
                -ms-transition:1s;
                -o-transition:1s;
                transition:1s;
            }
        </style>

javascript代码：

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