想恢復樣式，但好像不太行
<!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;
}
.p{
???border:;
????width:;
????height:;
????background:;
????color:;
}
</style>
</head>
<body>
????<p?id="p1"?>?JavaScript使網頁顯示動態效果并實現與用戶交互功能。</p>
????<input?type="button"?value="添加樣式"?onclick="add()"/>
????<input?type="button"?value="恢復樣式"?onclick="back1()"/>
<p?id="p2"?class="one">JavaScript使網頁顯示動態效果并實現與用戶交互功能。</p>
????<input?type="button"?value="更改外觀"?onclick="modify()"/>
????<input?type="button"?value="恢復樣式"?onclick="back2()"/>
<script?type="text/javascript">
???function?add(){
??????var?p1?=?document.getElementById("p1");
??????p1.className="one";
???}
???function?modify(){
??????var?p2?=?document.getElementById("p2");
??????p2.className="two";
???}
???function?back1()
???{
????????var?back=document.getElementById("one");??
????????back.className="p"
???}
???function?back2()
???{
?????????var?back=document.getElementById("two");??
????????back.className="p"
???}
</script>
</body>
</html>或許有更好的方法可以恢復樣式？
2019-11-19
var?back=document.getElementById("one");
var?back=document.getElementById("two");
你獲取ID 為one的元素和ID為two的元素，你根本都沒有定義，你怎么改變他的className
2019-11-08
贊 能不能一個按鈕同時讓兩個樣式都返回
2019-10-24
樓主nb
2019-09-29
<!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; } #pp{ ????border:; width:; height:; background:; color:; } </style> </head> <body> ????<p?id="p1"?>?JavaScript使網頁顯示動態效果并實現與用戶交互功能。</p> ????<input?type="button"?value="添加樣式"?onclick="add()"/> ????<input?type="button"?value="恢復樣式"?onclick="back1()"/> <p?id="p2"?class="one">JavaScript使網頁顯示動態效果并實現與用戶交互功能。</p> ????<input?type="button"?value="更改外觀"?onclick="modify()"/> ????<input?type="button"?value="恢復樣式"?onclick="back2()"/> <script?type="text/javascript"> ???function?add(){ ??????var?p1?=?document.getElementById("p1"); ??????p1.className="one"; ???} ???function?modify(){ ??????var?p2?=?document.getElementById("p2"); ??????p2.className="two"; ???} ???function?back1() ???{ ????????var?back=document.getElementById("p1");?? ????????back.className="pp"; ???} ???function?back2() ???{ ?????????var?back=document.getElementById("p2");?? ????????back.className="one"; ???} </script> </body> </html>已解決