jquery实现点击按钮变换背景颜色

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
    <script src="../js/jquery-1.11.2.min.js"></script>
</head>
<script type="text/javascript">
    $(function(){
        $("#nav li").click(function(){
            $("#nav li").eq($(this).index()).addClass("navdown").siblings().removeClass("navdown");
        })
    })
</script>
<style>
    a{text-decoration:none; color:#666666;}
    #nav ul{ list-style:none; float:left; text-align:right; margin-top: 18px; line-height: 42px; margin-left: -2px;}
    #nav ul li{ font-family:"微软雅黑","宋体"; font-size:14px; font-style:normal; font-weight:bold; letter-spacing:4px;}
    #nav ul li a:hover{ color:#666666;border:1px solid #F00;}
    .navdown a{color:#ff0000; border:1px solid #F00;}
</style>
<body>
<div id="nav">
    <ul>
        <li class="navdown"><a href="#"><span>网站首页</span></a></li>
        <li><a href="#"><span>关于我们</span></a></li>
        <li><a href="#"><span>新闻资讯</span></a></li>
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    </ul>
</div>
</body>
</html>

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转载自blog.csdn.net/ruiguang21/article/details/79969581