Js控制css——模仿视频网站关灯开灯

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <style type="text/css">
        .day
        {
            background-color:White;
        }
       
        .night
        {
            background-color:Black;
        }
    </style>
    <script type="text/javascript">
        function SwitchLight() {
            var btn = document.getElementById("btnChange");
            if (document.body.className == "night") {
                document.body.className = "day";
                btn.value = "关灯";
            }
            else if (document.body.className == "day") {
                document.body.className = "night";
                btn.value = "开灯";
            }
        }
    </script>
</head>
<body class="night">
    <input id="btnChange" type="button" value="开灯" onclick="SwitchLight()" />
</body>

</html>
转自: http://blog.csdn.net/woshixuye/article/details/7218726#comments
 

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