JAVA SCRIPT 下拉菜单默认是展开的，怎么能改成收缩的呢谢谢
<html><head><metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/><title><...
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<style type="text/css">
body{ font-size: 12px;}
h2,h3{ margin: 0;}
ul{ margin: 0; padding: 0; list-style: none; }
#outer_wrap li{ padding-left: 30px; line-height: 24px;}
.controlSymbol{ padding: 0 5px; border: 1px solid #adff2f; cursor: pointer;}
</style>
</head>
<body>
<ul id="DROP">
<li>
<h2>标题1</h2>
<ul>
<li>内容1</li>
<li>内容2</li>
<li>内容3</li>
<li>内容4</li>
</ul>
</li>
<li>
<h2>标题1</h2>
<ul>
<li>内容1</li>
<li>内容2</li>
<li>内容3</li>
<li>内容4</li>
</ul>
</li>
</ul>
</body>
</html>
<script>
var innerText = document.innerText ? 'innerText' : 'textContent';
var span = document.createElement('span');
span[innerText] = '+';
span.className = 'controlSymbol';
function $(id){
return document.getElementById(id);
}
function $_(){
var args = arguments;
var ret = [];
for(var i = 0; i < args.length; i++){
var temp = document.getElementsByTagName(args[i]);
try{
ret = ret.concat(Array.prototype.slice.call(temp,0));
}catch(e){
for(var j = 0; j < temp.length; j++){
ret.push(temp[j]);
}
}
}
return ret;
}
function addSymbol(h){
var innerSpan = span.cloneNode(true);
h.insertBefore(innerSpan,h.firstChild);
}
function next(el){
while(el.nextSibling){
if(el.nextSibling.nodeType == 1){
return el.nextSibling;
}
el = el.nextSibling;
}
return null;
}
var DROP = $('DROP');
var hs = $_('h2','h3');
for(var i = 0 ; i < hs.length; i++){
addSymbol(hs[i]);
}
DROP.onclick = function(event){
event = event || window.event;
var t = event.target || event.srcElement;
if(t.className == 'controlSymbol'){
var sn = next(t.parentNode);
var snStyle = next(t.parentNode).style;
snStyle.display = (snStyle.display == 'block' || snStyle.display == '') ? 'none' : 'block';
t[innerText] = t[innerText] == '+' ? '-':'+';
}
}
</script> 展开
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<style type="text/css">
body{ font-size: 12px;}
h2,h3{ margin: 0;}
ul{ margin: 0; padding: 0; list-style: none; }
#outer_wrap li{ padding-left: 30px; line-height: 24px;}
.controlSymbol{ padding: 0 5px; border: 1px solid #adff2f; cursor: pointer;}
</style>
</head>
<body>
<ul id="DROP">
<li>
<h2>标题1</h2>
<ul>
<li>内容1</li>
<li>内容2</li>
<li>内容3</li>
<li>内容4</li>
</ul>
</li>
<li>
<h2>标题1</h2>
<ul>
<li>内容1</li>
<li>内容2</li>
<li>内容3</li>
<li>内容4</li>
</ul>
</li>
</ul>
</body>
</html>
<script>
var innerText = document.innerText ? 'innerText' : 'textContent';
var span = document.createElement('span');
span[innerText] = '+';
span.className = 'controlSymbol';
function $(id){
return document.getElementById(id);
}
function $_(){
var args = arguments;
var ret = [];
for(var i = 0; i < args.length; i++){
var temp = document.getElementsByTagName(args[i]);
try{
ret = ret.concat(Array.prototype.slice.call(temp,0));
}catch(e){
for(var j = 0; j < temp.length; j++){
ret.push(temp[j]);
}
}
}
return ret;
}
function addSymbol(h){
var innerSpan = span.cloneNode(true);
h.insertBefore(innerSpan,h.firstChild);
}
function next(el){
while(el.nextSibling){
if(el.nextSibling.nodeType == 1){
return el.nextSibling;
}
el = el.nextSibling;
}
return null;
}
var DROP = $('DROP');
var hs = $_('h2','h3');
for(var i = 0 ; i < hs.length; i++){
addSymbol(hs[i]);
}
DROP.onclick = function(event){
event = event || window.event;
var t = event.target || event.srcElement;
if(t.className == 'controlSymbol'){
var sn = next(t.parentNode);
var snStyle = next(t.parentNode).style;
snStyle.display = (snStyle.display == 'block' || snStyle.display == '') ? 'none' : 'block';
t[innerText] = t[innerText] == '+' ? '-':'+';
}
}
</script> 展开
1个回答
展开全部
<ul id="DROP">
<li>
<h2>标题1</h2>
<ul style = "display:none">
<li>内容1</li>
<li>内容2</li>
<li>内容3</li>
<li>内容4</li>
</ul>
</li>
<li>
<h2>标题1</h2>
<ul style = "display:none">
<li>内容1</li>
<li>内容2</li>
<li>内容3</li>
<li>内容4</li>
</ul>
</li>
</ul>
给ul加个初始隐藏就可以了。
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