侧边导航栏css⽰例效果展⽰：
html：
<div class="sidebar">
<ul>
<li>优先级
<ul>
<li><aonclick=""class="sidebar-selected">全部</a></li>
医学
成像系统<li><aonclick="">P1</a></li><li><aonclick="">P2</a></li>
<li><aonclick=“" >P3</a></li>
地源热泵换热<li><aonclick="">P4</a></li> 汽车扎带</ul>
</li>
</ul>
css：
.sidebar {
border-right: 1px solid #f0f2f1;
width: 180px;
float: left;
padding-left: 35px;
}
.sidebar>ul {
list-style: none;
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padding: 0;
margin: 0;
}
.sidebar>ul>li {
font-size: 18px;
font-weight: 400;
padding: 0010px;
margin-top: 5px;
}
.sidebar>ul>li>ul {
border-top: 1px dashed rgba(0,0,0,0.1); display: block;
list-style: none;
margin: 5px010px0;
padding: 10px0010px;
font-size: 14px;
max-height: 138px;
overflow: auto;
}
.sidebar a {
line-height: 1.5;
}
.sidebar a:hover {
color: #e74430;
cursor:pointer;
}
.sidebar-selected {
color: #e74430;
}
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