下面才是对的,但是当列表展开时,可以点结点变成“收缩”,但是“收缩”后再点展开就不行?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
<script language="javascript" type="text/javascript">
function b1_onclick() {
if(b1.innerText=="+")
{
b1.innerText="-";
list1.style.display="block";
}
else
{
b1.innerText=="+";
list1.style.display="none";
}
}
</script>
</head>
<body>
<span id=b1 onclick="return b1_onclick()" style="border-right: #ff00ff thin ridge; border-top: #ff00ff thin ridge; border-left: #ff00ff thin ridge; border-bottom: #ff00ff thin ridge; cursor: hand;">-</span>list1<br />
<ul id=list1>
<li>
item1<br /></li>
<li>item2<br /></li>
<li>item3</li>
</ul>
list2</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
<script language="javascript" type="text/javascript">
function b1_onclick() {
if(b1.innerText=="+")
{
b1.innerText="-";
list1.style.display="block";
}
else
{
b1.innerText=="+";
list1.style.display="none";
}
}
</script>
</head>
<body>
<span id=b1 onclick="return b1_onclick()" style="border-right: #ff00ff thin ridge; border-top: #ff00ff thin ridge; border-left: #ff00ff thin ridge; border-bottom: #ff00ff thin ridge; cursor: hand;">-</span>list1<br />
<ul id=list1>
<li>
item1<br /></li>
<li>item2<br /></li>
<li>item3</li>
</ul>
list2</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
<script language="javascript" type="text/javascript">
// <!CDATA[function b1_ondblclick() {
if(b1.innerText=="+"){
b1.innerText="-";
list1.style.display="block";
}
else
{
b1.innerText="+"//这个错误太低级了b1.innerText=="+"
list1.style.display="none";
}
}// ]]>
</script>
</head>
<body>
<span id=b1 onclick="return b1_ondblclick()" style="border-right: thin ridge; border-top: thin ridge; border-left: thin ridge; border-bottom: thin ridge; cursor: hand;">-</span>list1<br />
<ul id=list1>
<li>
item1<br /></li>
<li>item2<br /></li>
<li>item3</li>
</ul>
list2</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
<script type="text/javascript">
// <!CDATA[function b1_ondblclick()
{
var b1 = document.getElementById('b1');
var list1 = document.getElementById('list1');
alert(b1.innerHTML);
if(b1.innerHTML=="+")
{
b1.innerHTML="-";
list1.style.display="block";
}
else
{
b1.innerHTML = "+"
list1.style.display="none";
}
}// ]]>
</script>
</head>
<body>
<span id=b1 onclick="b1_ondblclick()" style="border-right: thin ridge; border-top: thin ridge; border-left: thin ridge; border-bottom: thin ridge; cursor: hand;">-</span>list1<br />
<ul id=list1>
<li>
item1<br /></li>
<li>item2<br /></li>
<li>item3</li>
</ul>
list2
</body>
</html>
2.页面对象用document.getElementById去取
如:
var b1 = document.getElementById('b1');
var list1 = document.getElementById('list1');3.最好不要用innerText 用innerHTML 有的浏览器不支持这个属性