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5-localstorage.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>localstorage</title>
</head>
<body>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
ul.menu{
list-style: none;
margin: 20px 0 0 20px;
}
ul.menu>li{
width: 150px;
line-height: 40px;
border-bottom: 1px solid #ddd;
background: red;
}ul.menu>li>a{
display: block;
width: 100%;
height: 40px;
}
ul.submenu{
list-style: none;
background: #ccc;
width: 150px;
display: none;
}
</style>
<ul class="menu">
<li>
<a href="">菜单一</a>
<ul class="submenu">
<li>子菜单一</li>
<li>子菜单二</li>
<li>子菜单三</li>
<li>子菜单四</li>
</ul>
</li>
<li>
<a href="">菜单二</a>
<ul class="submenu">
<li>子菜单一</li>
<li>子菜单一</li>
<li>子菜单一</li>
<li>子菜单一</li>
</ul>
</li>
<li>
<a href="">菜单三</a>
<ul class="submenu">
<li>子菜单一</li>
<li>子菜单二</li>
<li>子菜单三</li>
<li>子菜单四</li>
</ul>
</li>
<li>
<a href="">菜单四</a>
<ul class="submenu">
<li>子菜单一</li>
<li>子菜单二</li>
<li>子菜单三</li>
<li>子菜单四</li>
</ul>
</li>
</ul>
<script type="text/javascript">
var li = document.querySelectorAll(".menu>li>a");
var sub = document.querySelectorAll(".submenu");
function subShow(i){
return function(e){
value = sub[i].style.display;
e = e || window.event;
if (value == null || value == '' || value == 'none') {
sub[i].style.display = "block";
localStorage.setItem("memoryMenu"+i,"block");
}else{
sub[i].style.display = "none";
localStorage.removeItem("memoryMenu"+i);
};
if(e.preventDefault){
e.preventDefault();
}else{
e.returnValue = false;
}
}
}
for (var i = 0; i < li.length; i++) {
li[i].onclick = subShow(i);
};
//页面初始化时检测哪个菜单是打开的
for(var key in localStorage ){
if (key.indexOf("memoryMenu")>=0) {
key = parseInt(key.slice(10));
sub[key].style.display = "block";
};
}
</script>
</body>
</html>