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我创建了一个页面（http://www.nextsteptutoring.co.uk/WhatWeTeach.html），其中包含4个可选h3元素，用于显示主题上的更多文本供用户阅读。无法使用javascript选择html元素
1st元素完美地工作 - 整个元素是可选的。第二和第三部分可以部分选择，可以点击+和第一个字母。第四个不能点击。
JS工作正常，我的CSS似乎没有问题，因为第一次工作正常，第二次和第三次部分正常。我看不出这是如何成为z-inex的，因为具有z-index值的页面上的唯一元素是页脚，并且加载也很好。
<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charset=windows-1252" http-equiv="content-type">
<link href="http://fonts.googleapis.com/css?family=Pacifico" rel="stylesheet" type="text/css">
<link href="http://fonts.googleapis.com/css?family=Cabin+Condensed" rel="stylesheet" type="text/css">
<link rel="stylesheet" href="Main.CSS">
<title>NST | What We Teach</title>
</head>
<body>
<div class="container">
<header> </header>
<div class="leftcolumn">
<h2>What We Teach</h2>
<p> Clear schemes of work, linked to the National Curriculum, which
are individually tailored to your child’s needs. We offer one to one
sessions, or small groups, with a maximum of 4 children. Groups are
based on specific needs/ability, rather than on chronological age.<br/>
<br/>
Programmes of study are adapted for high achievers in need of a
challenge, as well as those who lack confidence or require additional
support, outside of mainstream education.<br/>
</p>
</div>
<div class="rightcolumn">
<div class="hide">
<h3>+ Primary Maths</h3>
<ul>
<li>The four rules of number</li>
<li>Focus on Mental Arithmetic</li>
<li>Multiplication and associated division facts</li>
<li>Fractions, decimals and percentages</li>
<li>Data Handling, measures, and shapes</li>
<li>Algebra</li>
<li>Using and applying mathematical skills in everyday problem
solving</li>
<li>Confidence building and catch-up</li>
</ul>
</div>
<div class="hide">
<h3>+ Primary English</h3>
<ul>
<li>Clear focus on comprehension. Building skills of inference and
reasoning</li>
<li>Individually tailored spelling programme (specialised dyslexia
spelling programme)</li>
<li>Grammar and punctuation</li>
<li>Writing for different purposes and audiences</li>
<li>Handwriting</li>
<li>Confidence building and catch-up</li>
</ul>
</div>
<div class="hide">
<h3>+ Year 6 to Year 7 Transition</h3>
<p>Tailored English and Maths programme to support youngsters who
lack confidence during their transition from Primary to Secondary
education.</p>
</div>
<div class="hide">
<h3>+ Written Reports</h3>
<p>Parents may wish to receive a termly or yearly written report on
their child’s progress, and targets for the next phase of their
learning. This service will incur a fee of £10.</p>
</div>
</div>
<footer> </footer>
</div>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script type="text/javascript" src="http://code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("header").load("Header.txt");
});
$(document).ready(function(){
$("footer").load("Footer.txt");
});
$(".hide > h3").click(function(){
$(this).parent().toggleClass("show");
});
$(".show > h3").click(function(){
$(this).parent().toggleClass("hide");
});
</script>
</body>
</html>
footer {
position: fixed;
width: 100%;
bottom: 0;
left: 0;
background: rgba(150,150,150,1);
color: white;
text-align: center;
z-index: 5;
}
footer .container div {
display: inline-block;
padding: 5px 30px 2px 30px;
}
#contact {
background: rgba(120,117,185,1);
float: right;
padding: 5px 100px 2px 100px;
}
.hide h3 {
width: 100%;
background: rgba(171,167,242,0.75);
border-radius: 5px;
cursor: pointer;
padding: 2px 0 2px 8px;
}
.hide p, .hide ul {
opacity: 0;
height: 0;
}
.show {
height: auto;
}
.show p, .show ul {
opacity: 1;
list-style-type: square;
height: auto;
font-size: 18px;
}
任何想法将不胜感激！
谢谢乔尔，那工作完美！ –