试了一下用js指定li为a然后再在css里写样式，但是动不起来orz
不用js，用css设置translateX就可以了，如果想要有动效就加个transition时间，写了个demo，参考下：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title></title>
<style type="text/css">
li{
width: 100px;
height: 30px;
line-height: 30px;
font-size: 16px;
cursor: pointer;
margin-bottom: 10px;
background: lightblue;
transition: 0.3s ease;
}
li:hover{
transform: translateX(10px);
}
</style>
</head>
<body>
<div class="box">
<ul>
<li>111</li>
<li>222</li>
<li>333</li>
</ul>
</div>
</body>
</html>