SOURCE

h2>.hover()方法</h2>
    <div class="left">
        <div class="aaron1">
            <p>触发hover事件</p>
        </div>
    </div>
    <script type="text/javascript">
        $("p").hover(
            function() {
                $(this).css("background", 'red');
            },
            function() {
                $(this).css("background", '#2992cf');
            }
        );
    </script>

div.left,
        div.right {
            width: 350px;
            height: 150px;
            padding: 5px;
            margin: 5px;
            border: 1px solid #ccc;
        }
        
        p {
            height: 50px;
            border: 1px solid red;
            margin: 30px;
        }
        
        div.left {
            background: rgb(120, 194, 102);