<!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>无标题文档</title>
<script type="text/javascript">
function changeColor(){
var btnSwitch=document.getElementById("sw");
if(document.body.className="day"){
document.body.className="night";
btnSwitch.value="开灯";
}
else{
document.body.className="day";
btnSwitch.value="关灯";
}
}
</script>
<style type="text/css">
.day{
background-color:#FFF;
}
.night{
background-color:#000;
}
</style>
</head>
<body class="day">
<input id="sw" type="button" value="关灯" />
</body>
</html>
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