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可以參考下

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>className屬性</title>
<style>
??? body{ font-size:16px;}
??? .one{
?? ??? ?border:1px solid #eee;
?? ??? ?width:230px;
?? ??? ?height:50px;
?? ??? ?background:#ccc;
?? ??? ?color:red;
??? }
?? ?.two{
?? ??? ?border:1px solid #ccc;
?? ??? ?width:230px;
?? ??? ?height:50px;
?? ??? ?background:#9CF;
?? ??? ?color:blue;
?? ?}
?? ?</style>
</head>
<body>
??? <p id="p1" > JavaScript使網(wǎng)頁(yè)顯示動(dòng)態(tài)效果并實(shí)現(xiàn)與用戶交互功能。</p>
??? <input type="button" value="添加樣式1" onclick="add()"/>
??? <input type="button" value="添加樣式2" onclick="acc()"/>
?? ?<p id="p2" class="one">JavaScript使網(wǎng)頁(yè)顯示動(dòng)態(tài)效果并實(shí)現(xiàn)與用戶交互功能。</p>
??? <input type="button" value="更改外觀1" onclick="modify()"/>
??? <input type="button" value="更改外觀2" onclick="modifa()"/>

?? ?<script type="text/javascript">
?? ??? function add(){
?? ?????? var p1 = document.getElementById("p1");
?? ?????? p1.className="one";

?? ??? }
?? ??? function acc(){
?? ?????? var p1 = document.getElementById("p1");
?? ?????? p1.className="two";

?? ??? }
?? ??? function modify(){
?? ?????? var p2 = document.getElementById("p2");
?? ?????? p2.className="two";
?? ??? }
?? ??? function modifa(){
?? ?????? var p2 = document.getElementById("p2");
?? ?????? p2.className="one";
?? ??? }
?? ?</script>
</body>
</html>

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2019-05-04

源自：JavaScript入門篇 3-6

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3 回答

慕標(biāo)2283219
2019-05-19

后面精簡(jiǎn)一下：

??? <script type="text/javascript">
?????? function add(){
????????? document.getElementById("p1").className="one";

?????? }
?????? function acc(){
????????? document.getElementById("p1").className="two";

?????? }
?????? function modify(){
????????? document.getElementById("p2").className="two";
?????? }
?????? function modifa(){
????????? document.getElementById("p2").className="one";
?????? }
?????? </script>