问题描述：一级导航菜单有链接但是无法跳转，只能点击二级菜单才能跳转

<script src="/skin/js/bootstrap.min.js"></script>
<script src="/skin/js/swiper-bundle.min.js"></script>
<script src="/skin/js/owl.carousel.js"></script>
<script>
$(document).ready(function(){
$(document).off('click.bs.dropdown.data-api');
});
</script>

<nav class="navbar navbar-default">
                <div class="container">
                    <div class="navbar-header">
                        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
                            data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                            <span class="sr-only">Toggle navigation</span>
                            <span class="icon-bar"></span>
                            <span class="icon-bar"></span>
                            <span class="icon-bar"></span>
                        </button>
                        <a class="navbar-brand" href="/"><img src="{:cache('base')['xxl_weblogo']}" alt="{:cache('base')['xxl_webname']}" title="{:cache('base')['xxl_webname']}"></a>
                    </div>
                    <div class="m-search-icon">
                        <a href="#">
                            <div class="iconfont icon-sousuoxiao"></div>
                        </a>
                    </div>
                    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">							<ul class="nav navbar-nav">
                        <li {if !$tid}class="active"{/if}>
                            <a href="/">首页<span class="caret"></span></a>
                        </li>
                        {volist name="one_cate" id="v"}
                        <li class="dropdown {if $tid == $v['id'] || $thecate['pid'] == $v['id']}active{/if}">
                            <a href="{:url('/'.$v['htmldir'])}" class="dropdown-toggle" data-toggle="dropdown" >
                                  {$v['catname']}<span class="caret"></span></a>
                            <ul class="dropdown-menu">
                                {volist name="v.childs" id="vv"} 
                                <li><a href="{:url('/'.$vv['htmldir'])}">{$vv['catname']}</a></li>
                                {/volist}
                            </ul>
                        </li>
                        {/volist}
                        </ul>
                    </div>
                </div>
            </nav>