Yii2中Html的使用

<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu4">
<li role="presentation">
<?= Html::a('公共服务',['/jid/default/index','parent'=>'common','module'=>'user'],['role'=>'menuitem'])?>
</li>
<li role="presentation">
<?= Html::a('保单服务',['/jid/default/index','parent'=>'insurancepolicy','module'=>'policy'],['role'=>'menuitem'])?>
</li>
<li role="presentation">
<?= Html::a('信息服务',['/jid/default/index','parent'=>'information','module'=>'info'],['role'=>'menuitem'])?>
</li>
</ul>