<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.day
{
background-color:White;
}
.night
{
background-color:Black
}
</style>
<script language="javascript" type="text/javascript">
function operStyle() {
var divObj = document.getElementById("divContent");
var btnObj = document.getElementById("btnCommit");
if (divObj.className == "day") {
divObj.className = "night";
btnObj.value = "開(kāi)燈";
} else {
divObj.className = "day";
btnObj.value = "關(guān)燈";
}
}
//批量修改div的樣式屬性，由多種樣式構(gòu)成
//方法1：
function methodOne() {
var divObj = document.getElementById("divTest");
divObj.style.backgroundColor = "blue";
divObj.style.border = "solid 1px red";
divObj.style.width = "300px";
divObj.style.height = "200px";
divObj.style.backgroundPosition = "center";
}
//方法2：
function methodTwo() {
var divObj = document.getElementById("divTest");
divObj.style.cssText = "background-color:Blue; border:solid 1px red; width:300px; height:200px; background-position:center";
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="divContent" class="day">
<font color="red">我是一個(gè)div啊，咿呀咿呀呦！</font>
</div>
<input type="button" value="關(guān)燈" id="btnCommit" onclick="operStyle();" />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<hr />
<h1>修改divTest的樣式，多屬性操作</h1>
<div id="divTest" >
<font color="red">修改divTest的樣式</font>
</div>
<input type="button" value="修改divTest的樣式" onclick="methodTwo()" />
</form>
</body>
</html>
但是上面的方法有一個(gè)缺點(diǎn)，樣式一多，代碼就很多；而且通過(guò)JS來(lái)覆寫對(duì)象的樣式是比較典型的一種銷毀原樣式并重建的過(guò)程，這種銷毀和重建，都會(huì)增加瀏覽器的開(kāi)銷。
