<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>className属性</title>
<style>
body{ font-size:16px;}
.one{
border:10px solid #cab;
width:230px;
height:50px;
background:#ccc;
color:red;
}
.two{
border:10px solid #ccc;
width:230px;
height:50px;
background:#9CF;
color:blue;
}
</style>
</head>
<body>
<p id="p1" > JavaScript使网页显示动态效果并实现与用户交互功能。</p>
<input type="button" value="添加样式" onclick="add()"/>
<p id="p2" class="one">JavaScript使网页显示动态效果并实现与用户交互功能。</p>
<input type="button" value="更改外观" onclick="modify()"/>
<script type="text/javascript">
function add(){
var p1 = document.getElementById("p1");
p1.className="one";
}
var p2 = document.getElementById("p2");
p2.className="two";
document.write("现在的样式ID是:"+p2.className);
function modify(){
if(p2.className=="one")
{
p2.className="two"
}
else
{
p2.className="one"
}
}
</script>
</body>
</html>
自动切换的话需要使用到定时器。setInterval(),js定时器相关知识可以网上搜索一下,good luck
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>className属性</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使网页显示动态效果并实现与用户交互功能。</p>
<input type="button" value="添加样式" onclick="add()"/>
<p id="p2" class="one">JavaScript使网页显示动态效果并实现与用户交互功能。</p>
<input type="button" value="更改外观" onclick="modify()"/>
<input type="button" value="自动切换" onclick="start()">
<input type="button" value="停止" onclick="stop()"/>
<script type="text/javascript">
function add(){
var p1 = document.getElementById("p1");
p1.className='one';
}
function modify(){
var p2 = document.getElementById("p2");
p2.className=p2.className==='two'?'one':'two';
}
var init;
function start(){
init = self.setInterval('modify()',1000);
}
function stop(){
init = self.clearInterval(init);
}
</script>
</body>
</html>
我想问一下这个
p2.className=p2.className==='two'?'one':'two';
这个是什么意思?
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>className属性</title>
<style>
body{ font-size:16px;}
.one{
border:10px solid #cab;
width:230px;
height:50px;
background:#ccc;
color:red;
}
.two{
border:10px solid #ccc;
width:230px;
height:50px;
background:#9CF;
color:blue;
}
</style>
</head>
<body>
<p id="p1" > JavaScript使网页显示动态效果并实现与用户交互功能。</p>
<input type="button" value="添加样式" onclick="add()"/>
<p id="p2" class="one">JavaScript使网页显示动态效果并实现与用户交互功能。</p>
<input id="sh1" type="button" value="one" onclick="modify()"/>
<script type="text/javascript">
function add(){
var p1 = document.getElementById("p1");
p1.className="one";
}
var p2 = document.getElementById("p2");
var button = document.getElementById("button");
// p2.className="two";
// document.write("现在的样式ID是:"+p2.className);
function modify(){
if(p2.className=="one")
{
p2.className="two";
document.getElementById("sh1").value="two";
}
else
{
p2.className="one";
document.getElementById("sh1").value="one";
}
}
</script>
</body>
</html>
楼主写的已经可以更换样式了,我调整了一下button的问题