javascript - 下降时，导航栏进入页面内容下方

Question

我的页面上有这个表格，下面给出了导航栏的 css
问题是当菜单从导航栏上掉下来时，它就在 table 下面。显然我希望它位于页面上每个页面的顶部。

<div class="row" style="margin-top: 50px;">
        <div class="col-lg-12">
            <table class="table table-bordered">
            <tbody>
            <tr>
            <th class="info">o</th>
            <th class="info">Td</th>
            <th class="info">jdj</th>
            <th class="info">jd</th>
            <th class="info">js</th>
            </tr>
            <script type="text/javascript">

//further fetch data using javascript

导航栏的 css 和 jquery:

<style>
* {
    margin: 0;
    padding: 0;
    text-decoration: none
}

header {
    position: relative;
    width: 100%;
    background: #333;
}
.logo {
    position: relative;
    z-index: 123;
    padding: 10px;
    font: 18px verdana;
    color: #97455f;
    float: left;
    width: auto
}
.logo a {
    color: #97455f;
}
nav {
    position: relative;
    width: 100%;
    margin: 0 auto;
}
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #head-mobile {
    border: 0;
    list-style: none;
    line-height: 1;
    display: block;
    position: relative;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box
}
#cssmenu:after,
#cssmenu > ul:after {
    content: ".";
    display: block;
    clear: both;
    visibility: hidden;
    line-height: 0;
    height: 0
}
#cssmenu #head-mobile {
    display: none
}
#cssmenu {
    font-family: sans-serif;
    background: #333
}
#cssmenu > ul > li {

display:inline-block;
}
#cssmenu > ul > li > a {
    padding: 17px;
    font-size: 12px;
    letter-spacing: 1px;
    text-decoration: none;
    color: #ddd;
    font-weight: 700;
}
#cssmenu > ul > li:hover > a,
#cssmenu ul li.active a {
    color: #fff
}
#cssmenu > ul > li:hover,
#cssmenu ul li.active:hover,
#cssmenu ul li.active,
#cssmenu ul li.has-sub.active:hover {
    background: #97455f!important;
    -webkit-transition: background .3s ease;
    -ms-transition: background .3s ease;
    transition: background .3s ease;
}
#cssmenu > ul > li.has-sub > a {
    padding-right: 30px
}
#cssmenu > ul > li.has-sub > a:after {
    position: absolute;
    top: 22px;
    right: 11px;
    width: 8px;
    height: 2px;
    display: block;
    background: #ddd;
    content: ''
}
#cssmenu > ul > li.has-sub > a:before {
    position: absolute;
    top: 19px;
    right: 14px;
    display: block;
    width: 2px;
    height: 8px;
    background: #ddd;
    content: '';
    -webkit-transition: all .25s ease;
    -ms-transition: all .25s ease;
    transition: all .25s ease
}
#cssmenu > ul > li.has-sub:hover > a:before {
    top: 23px;
    height: 0
}
#cssmenu ul ul {
    position: absolute;
    left: -9999px
}
#cssmenu ul ul li {
    height: 0;
    -webkit-transition: all .25s ease;
    -ms-transition: all .25s ease;
    background: #333;
    transition: all .25s ease
}
#cssmenu ul ul li:hover {} #cssmenu li:hover > ul {
    left: auto
}
#cssmenu li:hover > ul > li {
    height: 35px
}
#cssmenu ul ul ul {
    margin-left: 100%;
    top: 0
}
#cssmenu ul ul li a {
    border-bottom: 1px solid rgba(150, 150, 150, 0.15);
    padding: 11px 15px;
    width: 170px;
    font-size: 12px;
    text-decoration: none;
    color: #ddd;
    font-weight: 400;
}
#cssmenu ul ul li:last-child > a,
#cssmenu ul ul li.last-item > a {
    border-bottom: 0
}
#cssmenu ul ul li:hover > a,
#cssmenu ul ul li a:hover {
    color: #fff
}
#cssmenu ul ul li.has-sub > a:after {
    position: absolute;
    top: 16px;
    right: 11px;
    width: 8px;
    height: 2px;
    display: block;
    background: #ddd;
    content: ''
}
#cssmenu ul ul li.has-sub > a:before {
    position: absolute;
    top: 13px;
    right: 14px;
    display: block;
    width: 2px;
    height: 8px;
    background: #ddd;
    content: '';
    -webkit-transition: all .25s ease;
    -ms-transition: all .25s ease;
    transition: all .25s ease
}
#cssmenu ul ul > li.has-sub:hover > a:before {
    top: 17px;
    height: 0
}
#cssmenu ul ul li.has-sub:hover,
#cssmenu ul li.has-sub ul li.has-sub ul li:hover {
    background: #363636;
}
#cssmenu ul ul ul li.active a {
    border-left: 1px solid #333
}
#cssmenu > ul > li.has-sub > ul > li.active > a,
#cssmenu > ul ul > li.has-sub > ul > li.active> a {
    border-top: 1px solid #333
}
@media screen and (max-width: 1000px) {
    .logo {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 46px;
        text-align: center;
        padding: 10px 0 0 0;
        float: none
    }
    .logo2 {
        display: none
    }
    nav {
        width: 100%;
    }
    #cssmenu {
        width: 100%;
        text-align:center;

    }
    #cssmenu ul {
        width: 100%;
        display: none
    }
    #cssmenu ul li {
        width: 100%;
        border-top: 1px solid #444
    }
    #cssmenu ul li:hover {
        background: #363636;
    }
    #cssmenu ul ul li,
    #cssmenu li:hover > ul > li {
        height: auto
    }
    #cssmenu ul li a,
    #cssmenu ul ul li a {
        width: 100%;
        border-bottom: 0
    }
    #cssmenu > ul > li {
        float: none
    }
    #cssmenu ul ul li a {
        padding-left: 25px
    }
    #cssmenu ul ul li {
        background: #333!important;
    }
    #cssmenu ul ul li:hover {
        background: #363636!important
    }
    #cssmenu ul ul ul li a {
        padding-left: 35px
    }
    #cssmenu ul ul li a {
        color: #ddd;
        background: none
    }
    #cssmenu ul ul li:hover > a,
    #cssmenu ul ul li.active > a {
        color: #fff
    }
    #cssmenu ul ul,
    #cssmenu ul ul ul {
        position: relative;
        left: 0;
        width: 100%;
        margin: 0;
        text-align: left
    }
    #cssmenu > ul > li.has-sub > a:after,
    #cssmenu > ul > li.has-sub > a:before,
    #cssmenu ul ul > li.has-sub > a:after,
    #cssmenu ul ul > li.has-sub > a:before {
        display: none
    }
    #cssmenu #head-mobile {
        display: block;
        padding: 23px;
        color: #ddd;
        font-size: 12px;
        font-weight: 700
    }
    .button {
        width: 55px;
        height: 46px;
        position: absolute;
        right: 0;
        top: 0;
        cursor: pointer;
        z-index: 12399994;
    }
    .button:after {
        position: absolute;
        top: 22px;
        right: 20px;
        display: block;
        height: 4px;
        width: 20px;
        border-top: 2px solid #dddddd;
        border-bottom: 2px solid #dddddd;
        content: ''
    }
    .button:before {
        -webkit-transition: all .3s ease;
        -ms-transition: all .3s ease;
        transition: all .3s ease;
        position: absolute;
        top: 16px;
        right: 20px;
        display: block;
        height: 2px;
        width: 20px;
        background: #ddd;
        content: ''
    }
    .button.menu-opened:after {
        -webkit-transition: all .3s ease;
        -ms-transition: all .3s ease;
        transition: all .3s ease;
        top: 23px;
        border: 0;
        height: 2px;
        width: 19px;
        background: #fff;
        -webkit-transform: rotate(45deg);
        -moz-transform: rotate(45deg);
        -ms-transform: rotate(45deg);
        -o-transform: rotate(45deg);
        transform: rotate(45deg)
    }
    .button.menu-opened:before {
        top: 23px;
        background: #fff;
        width: 19px;
        -webkit-transform: rotate(-45deg);
        -moz-transform: rotate(-45deg);
        -ms-transform: rotate(-45deg);
        -o-transform: rotate(-45deg);
        transform: rotate(-45deg)
    }
    #cssmenu .submenu-button {
        position: absolute;
        z-index: 99;
        right: 0;
        top: 0;
        display: block;
        border-left: 1px solid #444;
        height: 46px;
        width: 46px;
        cursor: pointer
    }
    #cssmenu .submenu-button.submenu-opened {
        background: #262626
    }
    #cssmenu ul ul .submenu-button {
        height: 34px;
        width: 34px
    }
    #cssmenu .submenu-button:after {
        position: absolute;
        top: 22px;
        right: 19px;
        width: 8px;
        height: 2px;
        display: block;
        background: #ddd;
        content: ''
    }
    #cssmenu ul ul .submenu-button:after {
        top: 15px;
        right: 13px
    }
    #cssmenu .submenu-button.submenu-opened:after {
        background: #fff
    }
    #cssmenu .submenu-button:before {
        position: absolute;
        top: 19px;
        right: 22px;
        display: block;
        width: 2px;
        height: 8px;
        background: #ddd;
        content: ''
    }
    #cssmenu ul ul .submenu-button:before {
        top: 12px;
        right: 16px
    }
    #cssmenu .submenu-button.submenu-opened:before {
        display: none
    }
    #cssmenu ul ul ul li.active a {
        border-left: none
    }
    #cssmenu > ul > li.has-sub > ul > li.active > a,
    #cssmenu > ul ul > li.has-sub > ul > li.active > a {
        border-top: none
    }

}
    #cssmenu > ul {float:right;}
    #cssmenu ul ul a {text-align: left;}
</style>

jquery如下:

(function($) {
    $.fn.menumaker = function(options) {  
     var cssmenu = $(this), settings = $.extend({
       format: "dropdown",
       sticky: false
     }, options);
     return this.each(function() {
       $(this).find(".button").on('click', function(){
         $(this).toggleClass('menu-opened');
         var mainmenu = $(this).next('ul');
         if (mainmenu.hasClass('open')) { 
           mainmenu.slideToggle().removeClass('open');
         }
         else {
           mainmenu.slideToggle().addClass('open');
           if (settings.format === "dropdown") {
             mainmenu.find('ul').show();
           }
         }
       });
       cssmenu.find('li ul').parent().addClass('has-sub');
    multiTg = function() {
         cssmenu.find(".has-sub").prepend('<span class="submenu-button"></span>');
         cssmenu.find('.submenu-button').on('click', function() {
           $(this).toggleClass('submenu-opened');
           if ($(this).siblings('ul').hasClass('open')) {
             $(this).siblings('ul').removeClass('open').slideToggle();
           }
           else {
             $(this).siblings('ul').addClass('open').slideToggle();
           }
         });
       };
       if (settings.format === 'multitoggle') multiTg();
       else cssmenu.addClass('dropdown');
       if (settings.sticky === true) cssmenu.css('position', 'fixed');
    resizeFix = function() {
      var mediasize = 1000;
         if ($( window ).width() > mediasize) {
           cssmenu.find('ul').show();
         }
         if ($(window).width() <= mediasize) {
           cssmenu.find('ul').hide().removeClass('open');
         }
       };
       resizeFix();
       return $(window).on('resize', resizeFix);
     });
      };
    })(jQuery);

    (function($){
    $(document).ready(function(){
    $("#cssmenu").menumaker({
       format: "multitoggle"
    });
    });
    })(jQuery);

导航栏部分:

<li ><a href="#">some</a>
<ul>
<li><a href="#>some</a></li>
            <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
           <li><a href="#">some</a></li>
</ul>
</li>

我似乎无法找到我哪里出错了。任何帮助将不胜感激。我希望当菜单下降时，内容保留在所有内容之上，而是恰好位于我页面上的表格下方。我花了几个小时寻找我做错了什么，但我可以忽略哪怕是最小的错误。请帮忙!

Answer 1

将 z-index 属性添加到您的菜单项，其值大于基础内容。