原生js做的手风琴效果的导航菜单

前端技术 2023/09/05 JavaScript

做好的手风琴效果如下，具体看代码：
 
html代码

复制代码 代码如下:

<!doctype html>
<html>
<head>
<meta charset=\"utf-8\">
<title>Accordion</title>
<style>
#accordion{
width:200px;
}
#accordion ul{
list-style: none;
display:none;
}
.first-level{
background-color: #d8d8d8;
background-color: rgba(236, 208, 208, 0.53);
border-radius: 4px;
display: block;
cursor: pointer;
position: relative;
margin: 2px 0 0 0;
padding: 8px;
min-height: 0;
}
</style>
</head>
<body>
<div id=\"accordion\">
<div>
<h3 class=\"first-level\">level one</h3>
<ul>
<li>first item</li>
<li>second item</li>
<li>third item</li>
</ul>
</div>
<div>
<h3 class=\"first-level\">level one</h3>
<ul>
<li>first item</li>
<li>second item</li>
<li>third item</li>
</ul>
</div>
<div>
<h3 class=\"first-level\">level one</h3>
<ul>
<li>first item</li>
<li>second item</li>
<li>third item</li>
</ul>
</div>
</div>
<script src=\"common.js\"></script>
<script>
var heads = document.querySelectorAll(\".first-level\");
function headClick(event){
var target = EventUtil.getTarget(event);
toggleDisplay(target.parentNode.querySelector(\"ul\"));
}
for(var i=0;i<heads.length;i++){
EventUtil.addHandler(heads[i], \"click\", headClick);
}

window.onunload = function (){
for(var i=0;i<heads.length;i++){
EventUtil.removeHandler(heads[i], \"click\", headClick);
}
heads = null;
}

common.js文件
复制代码 代码如下:

var EventUtil = {
addHandler : function (element, type, handler) {
if (element.addEventListener) {
element.addEventListener(type, handler, false);
} else if (element.attachEvent) {
element.attachEvent(\"on\" + type, handler);
} else {
element[\"on\" + type] = handler;
}
},
removeHandler : function (element, type, handler) {
if (element.removeEventListener) {
element.removeEventListener(type, handler, false);
} else if (element.detachEvent) {
element.detachEvent(\"on\" + type, handler);
} else {
element[\"on\" + type] = null;
}
},
getEvent : function (event) {
return event || window.event;
},
getTarget : function (event) {
return event.target || event.srcElement;
}
}


var getStyle = function (el, style) {
if (el.currentStyle) {
style = style.replace(/\\-(\\w)/g, function (all, letter) {
return letter.toUpperCase();
});
var value = el.currentStyle[style];
return value;
} else {
return document.defaultView.getComputedStyle(el, null).getPropertyValue(style);
}
}


var toggleDisplay = function (element) {
var display = getStyle(element, \"display\");
if (display == \"none\") {
element.style.display = \"block\";
} else {
element.style.display = \"none\";
}
}

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