bootstarp是一个非常棒的前端开发框架，在自适应手机网站制作课程中，我们讲了怎么使用bootstarp框架去制作各类响应式网站。使用bootstarp框架和wordpress配合建网站时，比较麻烦的就是制作响应式二级下拉菜单。

下面学做网站就来介绍一下wordpress如何制作bootstarp响应式二级下拉菜单。

方法/步骤

1. 首先在导航菜单位置，使用以下的代码进行替换；

<nav class="mainmenu-area stricky">
        <div class="container">
            <div class="navigation pull-left">
                <div class="nav-header">
                <?php wp_nav_menu( array( 'container' => '','menu_class' => 'topmeau','menu_id' => "nav_top",'depth' => 2, ) ); ?>          
                </div>
                <div class="nav-footer">
                    <button><i class="fa fa-bars"></i></button>
                </div>
            </div>
            <div class="search-box pull-right">
                <form action="#">
                    <input type="text" placeholder="Search...">
                    <button type="submit"><i class="fa fa-search"></i></button>
                </form>
            </div>
        </div>
    </nav>

2.将以下的CSS代码加到style.css中，用于控制bootstarp响应式二级下拉菜单的样式；

/* 5 .mainmenu-area styles */

.mainmenu-area {
    background: #262F36;
    border-bottom: 4px solid #186AAB;
}
.mainmenu-area.stricky-fixed {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 99999;
}
.navigation .nav-footer {
    display: none;
}
.navigation .nav-header > ul {
    padding: 0;
    margin: 0;
}
.navigation .nav-header > ul > li {
    display: inline-block;
    position: relative;
}
.navigation .nav-header > ul > li:first-child > a {
    padding-left: 0;
}
.navigation .nav-header > ul > li > a {
    display: block;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    color: #FFFFFF;
    padding: 23px 19px;
    transition: all .3s ease;
}
.navigation .nav-header > ul > li:hover > a {
    color: #186AAB;
}
.navigation .nav-header > ul > li:hover > ul {
    opacity: 1;
    visibility: visible;
}
.navigation .nav-header > ul > li > ul {
    position: absolute;
    top:100%;
    left:0;
    z-index: 999;
    background: #fff;
    width: 240px;
    margin: 0;
    padding: 0;
    opacity: 0;
    visibility: hidden;
    box-shadow: 2px 0 11px -3px rgba(0,0,0,.2);
    transition: all .5s ease;
}
.navigation .nav-header > ul > li > ul > li {
    display: block;
    position: relative;
}
.navigation .nav-header > ul > li > ul > li:last-child > a {
    border-bottom: 0;
}
.navigation .nav-header > ul > li > ul > li > a {
    display: block;
    font-size: 14px;
    font-weight: 500;
    text-transform: capitalize;
    color: #2B2B2B;
    padding: 14px 19px;
    border-bottom: 1px solid #E9E9E9;
    transition: all .3s ease;
}
.navigation .nav-header > ul > li > ul > li:hover > a {
    background: #186AAB;
    color: #fff;
    border-color: 0;
}
.navigation .nav-header > ul > li > ul > li:hover > ul {
    opacity: 1;
    visibility: visible;
}
.navigation .nav-header > ul > li > ul > li > ul {
    position: absolute;
    top:0;
    left:100%;
    width: 240px;
    margin: 0;
    padding: 0;
    opacity: 0;
    visibility: hidden;
    z-index: 999;
    background: #fff;
    box-shadow: 2px 0 11px -3px rgba(0,0,0,.2);
    transition: all .5s ease;
}
.navigation .nav-header > ul > li > ul > li > ul > li {
    display: block;
    position: relative;
}
.navigation .nav-header > ul > li > ul > li > ul > li:last-child > a {
    border-bottom: 0;
}
.navigation .nav-header > ul > li > ul > li > ul > li > a {
    display: block;
    font-size: 14px;
    font-weight: 500;
    text-transform: capitalize;
    color: #2B2B2B;
    padding: 14px 19px;
    border-bottom: 1px solid #E9E9E9;
    transition: all .3s ease;
}
.navigation .nav-header > ul > li > ul > li > ul > li:hover > a {
    background: #186AAB;
    color: #fff;
    border-color: 0;
}
.navigation .nav-header .dropdown a button {display: none;}

.mainmenu-area .search-box {
    width: 280px;
    height: 66px;
    background: #2D373F;
    padding: 0 25px;
}
.mainmenu-area .search-box input {
    background-color: transparent;
    border: none;
    outline: none;
    color: #DAD9D9;
    font-size: 13px;
    line-height: 65px;
    width: calc(100% - 31px);
}
.mainmenu-area .search-box button {
    background-color: transparent;
    border: none;
    outline: none;
    font-size: 15px;
    line-height: 65px;
    color: #DAD9D9;
}

3. 将以下的代码放到JS里，并且在代码中引用；

// 12 mobileMenu
function mobileMenu () {
    if ($('.navigation .nav-footer button').length) {
        $('.navigation .nav-footer button').on('click', function () {
            $('.navigation .nav-header').slideToggle();
            $('.navigation .nav-header').find('.dropdown').children('a').append(function () {
                return '<button><i class="fa fa-bars"></i></button>';
            });
            $('.navigation .nav-header .dropdown a button').on('click', function () {
                $(this).parent().parent().children('ul.sub-menu').slideToggle();
                return false;
            });
        });
    };
}

4. 然后通过后台菜单设置导航菜单项，在设置带有二级导航的一级导航时，需要添加一个class类，名为：dropdown 如下图：

5. 这样就可以制作出带有二级下拉菜单的bootstarp响应式二级下拉菜单了。