【CSS实现hover动态效果】

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
    </head>
    <style type="text/css">
        .wrap {
            width: 500px;
            height: 500px;
            margin: 0 auto;
            border: 1px solid blue;
        }
        .con {
            width: 80%;
            height: 100px;
            margin: 40px auto;
            border: 1px solid black;
        }
        /*必须在父级hover，兼容：IE6+*/
        .one:hover p {
            color: red;
        }
        /*标签内要加data-title属性，兼容：IE9+*/
        .two:hover::before {
            content: attr(data-title);/*取到data-title属性的值*/
            color: green;
        }
        .three:hover::after {
            content: attr(data-title);/*取到data-title属性的值*/
            color: blue;
        }
    </style>
    <body>
        <p>
            <p class="con one">
                <span>鼠标移进来</span>
                <p>颜色会变哦</p>
            </p>
            <p class="con two" data-title="看我七十二变">
                <span>鼠标移进来</span>
                <p>文字会变哦</p>
            </p>
            <p class="con three" data-title="看我七十二变">
                <span>鼠标移进来</span>
                <p>文字会变哦</p>
            </p>
        </p>
    </body>
</html>

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