目标效果：点击标签1，如果列表标签的style的display是block,改成none，否则改成block，来达到展开收缩菜单效果
一.准备阶段
html文件
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="box">
<p id="btn">标签1</p>
<ul id="ull" style="display: block;">
<li><a href="#">手写</a></li>
<li><a href="#">拼音</a></li>
</ul>
</div>
</body>
</html>
运行后页面效果
二.：点击标签1隐藏列表
方法1
html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="box">
<p id="btn" onclick="document.getElementById('ull').style.display='none'">标签1</p>
<ul id="ull" style="display: block;">
<li><a href="#">手写</a></li>
<li><a href="#">拼音</a></li>
</ul>
</div>
</body>
</html>
效果从上图到下图
方法2
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function tonone() {
document.getElementById('ull').style.display='none';
}
</script>
</head>
<body>
<div id="box">
<p id="btn" onclick="tonone()">标签1</p>
<ul id="ull" style="display: block;">
<li><a href="#">手写</a></li>
<li><a href="#">拼音</a></li>
</ul>
</div>
</body>
</html>
方法3
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload=function ()
{
document.getElementById('btn').onclick=function ()
{
document.getElementById('ull').style.display='none';
}
}
</script>
</head>
<body>
<div id="box">
<p id="btn" >标签1</p>
<ul id="ull" style="display: block;">
<li><a href="#">手写</a></li>
<li><a href="#">拼音</a></li>
</ul>
</div>
</body>
</html>
方法4
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload=function ()
{
var obtn = document.getElementById('btn');
var oull = document.getElementById('ull');
obtn.onclick=function ()
{
oull.style.display='none';
}
}
</script>
</head>
<body>
<div id="box">
<p id="btn" >标签1</p>
<ul id="ull" style="display: block;">
<li><a href="#">手写</a></li>
<li><a href="#">拼音</a></li>
</ul>
</div>
</body>
</html>
在方法4基础上加上if判断就可以实现页面展开收缩菜单功能
代码如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
window.onload=function ()
{
var obtn = document.getElementById('btn');
var oull = document.getElementById('ull');
obtn.onclick=function ()
{
if(oull.style.display=='none')
{
oull.style.display='block'
}
else
{
oull.style.display='none'
}
}
}
</script>
</head>
<body>
<div id="box">
<p id="btn" >标签1</p>
<ul id="ull" style="display: block;">
<li><a href="#">手写</a></li>
<li><a href="#">拼音</a></li>
</ul>
</div>
</body>
</html>
效果如下