<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
.li2{
display: none;
}
.li4{
visibility: hidden;
}
</style>
</head>
<body>
<ul>
<li>我是一</li>
<li class="li2">我是二</li>
<li>我是三</li>
<li class="li4">我是四</li>
<li>我是五</li>
</ul>
</body>
</html>