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下面的代码是我用HTML，CSS和JavaScript创建的手风琴列表。有什么方法可以在标题的左上角添加加号和减号图片吗？所以当我点击标题“A”或“B”时，图片从加号变成减号。这里有两个图像我想用：手风琴表的加/减图片
https://www.independencecenter.org/wp-content/uploads/2014/04/wellness.png
(function() {
var accordions, i;
// Make sure the browser supports what we are about to do.
if (!document.querySelectorAll || !document.body.classList) return;
// Using a function helps isolate each accordion from the others
function makeAccordion(accordion) {
var targets, currentTarget, i;
targets = accordion.querySelectorAll('.accordion > * >h1 ');
for(i = 0; i < targets.length; i++) {
targets[i].addEventListener('click', function (e) {
/*Added the code below*/
if (e.target.parentNode.classList.contains("expanded")) {
e.target.parentNode.classList.remove("expanded")
} else {
/*Else do the following, same as before */
if (currentTarget)
currentTarget.classList.remove('expanded');
currentTarget = this.parentNode;
currentTarget.classList.add('expanded');
}
}, false);
}
accordion.classList.add('js');
}
// Find all the accordions to enable
accordions = document.querySelectorAll('.accordion');
console.log(accordions);
// Array functions don't apply well to NodeLists
for(i = 0; i < accordions.length; i++) {
makeAccordion(accordions[i]);
}
})();<style>
/*All paragraphs*/
.p {
margin: 5px;
color: #007a5e;
}
.bold {
color: #007a5e;
font-weight:bold;
}
.boldwhite {
font-weight:bold;
}
/*Accordion Movement*/
.accordion.js > * {
overflow: hidden;
}
.accordion.js > *:not(.expanded) > *:not(h1) {
max-height: 0;
margin-top: 0;
margin-bottom: 0;
opacity: 0;
visibility: hidden;
overflow: hidden;
}
.accordion.js > .expanded > *:not(h1) {
opacity: 1;
visibility: visible;
}
.accordion.js > * > h1 {
cursor: pointer;
visibility: visible;
}
.accordion.js > * > *:not(h1) {
transition: max-height 0.5s, visibility 0.5s, margin 0.5s, opacity 0.5s;
}
/*Section Properties*/
.sections {
font-family: Verdana;
font-weight: lighter;
color: #5E5E5E;
text-align: center;
border-style: solid;
border-width: 1px;
border-color: #dddddd;
padding: 5px;
background-color: #FCFCFC;
border-radius: 1px;
}
.sections:hover {
box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
-moz-box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
-webkit-box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
-o-box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
/*Green Section Properties*/
.sections2 {
font-family: Verdana;
font-weight: lighter;
color: #5E5E5E;
text-align: center;
border-style: solid;
border-width: 1px;
border-color: #ccd6e0;
padding: 5px;
background-color:rgba(224, 235, 245,0.3);
border-radius: 1px;
}
.sections2:hover {
box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
-moz-box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
-webkit-box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
-o-box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.accordion > section > div {
margin-bottom: 15px;
}
</style><section class="accordion js">
<section class="sections">
<h1><span style="font-size: 18px;">A</span></h1>
<div>
<p class="p" style="text-align: center;"><span style="color: #007a5e;">aerheahqeh.</span></p>
</div>
</section>
<br style="line-height: 15px;"/>
<section class="sections2">
<h1><span style="font-size: 18px;">B</span></h1>
<div>
<p class="p" style="text-align: center;">Twtjwrjwrj </p>
</div>
</section>
</section>