<p>我正在使用 bootstrap 5 cdn，我想打开下拉列表而不单击下拉列表。</p> <p>我使用导航栏并希望显示“下拉链接”：</p> <pre class="brush:php;toolbar:false;">&lt;nav class=&quot;navbar navbar-expand-sm navbar-light bg-light&quot;&gt; &lt;div class=&quot;container-fluid&quot;&gt; &lt;a class=&quot;navbar-brand&quot; href=&quot;#&quot;&gt;Navbar&lt;/a&gt; &lt;button class=&quot;navbar-toggler&quot; type=&quot;button&quot; data-bs-toggle=&quot;collapse&quot; data-bs-target=&quot;#navbarNavDropdown&quot; aria-controls=&quot;navbarNavDropdown&quot; aria-expanded=&quot;false&quot; aria-label=&quot;Toggle navigation&quot; &gt; &lt;span class=&quot;navbar-toggler-icon&quot;&gt;&lt;/span&gt; &lt;/button&gt; &lt;div class=&quot;collapse navbar-collapse&quot; id=&quot;navbarNavDropdown&quot;&gt; &lt;ul class=&quot;navbar-nav&quot;&gt; &lt;li class=&quot;nav-item&quot;&gt; &lt;a class=&quot;nav-link active&quot; aria-current=&quot;page&quot; href=&quot;#&quot;&gt;Home&lt;/a&gt; &lt;/li&gt; &lt;li class=&quot;nav-item dropdown&quot;&gt; &lt;a class=&quot;nav-link dropdown-toggle&quot; href=&quot;#&quot; id=&quot;test&quot; role=&quot;button&quot; data-bs-toggle=&quot;dropdown&quot; aria-expanded=&quot;false&quot; &gt; Dropdown link &lt;/a&gt; &lt;ul class=&quot;dropdown-menu&quot; aria-labelledby=&quot;navbarDropdownMenuLink&quot;&gt; &lt;li&gt;&lt;a class=&quot;dropdown-item&quot; href=&quot;#&quot;&gt;Action&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a class=&quot;dropdown-item&quot; href=&quot;#&quot;&gt;Another action&lt;/a&gt;&lt;/li&gt; &lt;li&gt;&lt;a class=&quot;dropdown-item&quot; href=&quot;#&quot;&gt;Something else here&lt;/a&gt;&lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;/div&gt; &lt;/nav&gt; &lt;button class=&quot;btn btn-primary btn-sm&quot; (click)=&quot;open()&quot;&gt;Abrir&lt;/button&gt;</pre> <p>在组件中我尝试执行以下操作，但它不起作用：</p> <pre class="brush:php;toolbar:false;">export class AppComponent { open() { const dropdown = document.getElementById('test'); dropdown.click(); } }</pre> <p>我在 stackblitz 中做到了：测试</p>

<button
    class="btn btn-primary btn-sm"
    type="button"
    data-bs-toggle="collapse"
    data-bs-target="#navbarNavDropdown"
    aria-controls="navbarNavDropdown"
    aria-expanded="false"
    aria-label="Toggle navigation"
 >
     Abrir
</button>