弹出菜单

 <button id="exportWord" type="submit" class="btn btn-sm btn-primary " onclick="document.getElementsByTagName('nav')[0].className = 'menu menu_active'">导出word</button>

                        <nav class="menu panel panel-default">
                            <p onclick="document.getElementsByTagName('nav')[0].className = 'menu'">关闭</p>
                            <ol>
                                <li class="menu-item listing"><a href="#0" data-text="listing">一人有限公司</a>
                                    <ol class=sub-menu">
                                        <li class="menu_item listing_process"><a data-text="process">公司挂牌申请流程</a></li>
                                        <li class="menu_item one_listing"><a href="#0" data-text="one">一人有限公司挂牌</a></li>
                                        <li class="menu_item many_listing"><a href="#0" data-text="multi">多人有限公司挂牌</a></li>
                                    </ol>
                                </li>
                            </ol>
                            <ol>
                                <li class="menu-item"><a href="#0">多人有限公司</a>
                                    <ol class=sub-menu">
                                        <li class="menu_item"><a href="#0">公司挂牌申请流程</a></li>
                                        <li class="menu_item"><a href="#0">多人有限公司挂牌</a></li>
                                    </ol>
                                </li>
                            </ol>
                        </nav>
                    </div>

 nav a {
        color: inherit;
        text-decoration: none;
    }

    nav {
        line-height: 1.4;
        font-family: "Space Mono", monospace;
        background: rgba(236, 236, 236, 0.12);
        padding: 25px 35px;
        width: 350px;
        top: calc(40vh);
        left: calc(25vw);
        position: fixed;
        border-radius: 16px;
        box-shadow: 0 0 60px -15px black;
        transform: scale(0) rotate(360deg);
        transition: all 0.75s;
        font-size: 18px;
      /*  opacity:0.9;
        filter:alpha(opacity=90);*/
    }

    nav.menu_active {
        transform: scale(1) rotate(0deg);
    }
    nav > ol > li {
        margin: 20px 0;
        color: #ff6c18;
    }

    nav > ol > li:first-of-type {
        color: #ff6c18;
    }

    nav > ol > li > ol {
        margin: 10px 0 0 20px;
        border-left: 1px solid #4d4d4c;
        color: #4d3c7d;
    }

    nav > ol > li > ol > li {
        margin: 7px 0;
        padding-left: 20px;
    }

    nav a:hover {
        color: #dd925f;
    }



    nav p {
        font-family: "Roboto Mono", monospace;
        float: right;
        cursor: pointer;
        font-size: 16px;
        color: #1642dc;
        transition: all 0.2s;
    }

    nav p:hover {
        border-bottom: 2px dotted #cfd8dc;
        padding-bottom: 5px;
    }