Bootstrap下拉产品锚标记不起作用

Question

这是代码

<li class="dropdown">
    <a href="product.php" data-toggle="dropdown" class="dropdown-toggle"  data-toggle="dropdown" data-hover="dropdown"  data-animations="zoomIn zoomIn zoomIn zoomIn">
        Products
        <i class="fa fa-angle-down" aria-hidden="true"></i>
    </a>
    <ul class="dropdown-menu first">
        <li>
            <a href="safe.php">Safe</a>
        </li>

    </ul>
</li>

我要单击产品锚标记，该页面将转到另一页面