為什么不能實(shí)現(xiàn)
<!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(hù)交互功能。</p>
? ? <input type="button" value="添加樣式" onclick="add()"/>
<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(hù)交互功能。</p>
? ? <input type="button" value="更改外觀" onclick="modify()"/>
<script type="text/javascript">
? ?function add(){
? ? ? var p1 = document.getElementById("p1");
? ? ??
? ?}
? ?function modify(){
? ? ? var p2 = document.getElementById("p2");
? ? ??
? ?}
</script>
</body>
</html>
2019-04-24
代碼你都沒(méi)有打上去，實(shí)現(xiàn)什么。。。點(diǎn)擊當(dāng)然什么東西都不發(fā)生
2019-04-09
<!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(hù)交互功能。</p>
??? <input type="button" value="添加樣式" onclick="add()"/>
?? ?<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(hù)交互功能。</p>
??? <input type="button" value="更改外觀" onclick="modify()"/>
?? ?<script type="text/javascript">
?? ??? function add(){
?? ?????? var p1 = document.getElementById("p1");
?? ?????? document.write("p元素的值為:"+p1.className);
?? ??? }
?? ??? function modify(){
?? ?????? var p2 = document.getElementById("p2");
?? ?????? document.write("p2元素值為:"+p2.className);
?? ??? }
?? ?</script>
2019-04-04
你代碼都不完整，怎么去實(shí)現(xiàn)啊，33行跟37行你都補(bǔ)上去
<!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(hù)交互功能。</p>
? ? <input type="button" value="添加樣式" onclick="add()"/>
? ? <input type="button" value="清除樣式" 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(hù)交互功能。</p>
? ? <input type="button" value="更改外觀" onclick="modify()"/>
? ? <input type="button" value="清楚外觀" onclick="modiyf()"/>
<script type="text/javascript">
? ?function add(){
? ? ? var p1 = document.getElementById("p1");
? ? ? p1.className="one";
? ?}
? ?function acc(){
? ?var p1 = document.getElementById("p1");
? ?p1.className="tow";
? ?}
? ?function modify(){
? ? ? var p2 = document.getElementById("p2");
? ? ? p2.className="tow";
? ?}
? ?function modiyf(){
? ? ? var p2 = document.getElementById("p2");
? ? ? p2.className="one";
? ?}
</script>
</body>
</html>
2019-03-30
<!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(hù)交互功能。</p>
? ? <input type="button" value="添加樣式" onclick="add()"/>
<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(hù)交互功能。</p>
? ? <input type="button" value="更改外觀" onclick="modify()"/>
<script type="text/javascript">
? ?function add(){
? ? ? var p1 = document.getElementById("p1");
? ?p1.className = "one" ;
? ?}
? ?function modify(){
? ? ? var p2 = document.getElementById("p2");
? ? ?p2.className = "two" ;?
? ?}
</script>
</body>
</html>