JS:onmouseover 、onmouseout

鼠标移动到P标签上时，改变文本和边框样式

        <style type="text/css">
            .onmouseover {
                color: red;
                border: 1px solid blue;
                cursor: hand;            
        </style>
        <script type="text/javascript">            
            function over() {
                var p = document.getElementById("p");
                //选择器className修改。
                p.className = "onmouseover";
            }
            function out() {
                var p = document.getElementById("p");
                p.className = "";
            }
        </script>
 
    <body> 
        <p onmouseover="over()" onmouseout="out()" id="p">鼠标移动到P标签上时，改变文本和边框样式</p>
    </body>