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This is the framework of adminlte

The principle is to use the class of the parent node to control the display mode of child nodes,

The pop-up menu is the child node of your hover

https://adminlte.io/themes/Ad...

In fact, just look at the code of adminlte and you will know

    <li class="active treeview menu-open">
      <a href="#">
        <i class="fa fa-dashboard"></i> <span>Dashboard</span>
        <span class="pull-right-container">
          <i class="fa fa-angle-left pull-right"></i>
        </span>
      </a>
      <ul class="treeview-menu">
        <li><a href="index.html"><i class="fa fa-circle-o"></i> Dashboard v1</a></li>
        <li class="active"><a href="index2.html"><i class="fa fa-circle-o"></i> Dashboard v2</a></li>
      </ul>
    </li>