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How to implement the top navigation bar with CSS+HTML

醉折花枝作酒筹forward: 2021-04-30 09:14:423537browse

This article will introduce to you how to implement the top navigation bar with CSS HTML. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Implementation of navigation bar, fixed top navigation bar, and secondary menu implementation

Rendering:

How to implement the top navigation bar with CSS+HTML

When I was using this navigation bar recently, I found that when the page was zoomed in and out, the layout and display of the navigation bar had some minor problems, so I changed the css part of the code and reposted it

New code implementation (optimized layout):

<html>
   <head>
       <style type="text/css">
        .top{
    /* 设置宽度高度背景颜色 */
    height: auto; /*高度改为自动高度*/
    width:100%;
    margin-left: 0;
    background:rgb(189, 181, 181);
    position: fixed; /*固定在顶部*/
    top: 0;/*离顶部的距离为0*/
    margin-bottom: 5px;
}
.top ul{
    /* 清除ul标签的默认样式 */
    width: auto;/*宽度也改为自动*/
    list-style-type: none;
    white-space:nowrap;
    overflow: hidden;
    margin-left: 5%;
    /* margin-top: 0;          */
    padding: 0;

}
.top li {
    float:left; /* 使li内容横向浮动，即横向排列  */
    margin-right:2%;  /* 两个li之间的距离*/
    position: relative;
    overflow: hidden;
}

.top li a{
   /* 设置链接内容显示的格式*/
    display: block; /* 把链接显示为块元素可使整个链接区域可点击 */
    color:white;
    text-align: center;
    padding: 3px;
    overflow: hidden;
    text-decoration: none; /* 去除下划线 */
    
}
.top li a:hover{
    /* 鼠标选中时背景变为黑色 */
    background-color: #111;
}
.top ul li ul{
    /* 设置二级菜单 */
    margin-left: -0.2px;
    background:rgb(189, 181, 181);
    position: relative;
    display: none; /* 默认隐藏二级菜单的内容 */

}
.top ul li ul li{
    /* 二级菜单li内容的显示 */
    
    float:none;
    text-align: center;
}
.top ul li:hover ul{
    /* 鼠标选中二级菜单内容时 */
    display: block;
}
body{
    background:#eff3f5;
}

       </style>
        <body>
            <div class="top">
                   <center> 
                    <ul>
                    <li><a href="#">一级菜单</a></li>
                    <li><a href="#">一级菜单</a></li>
                    <li><a href="#">一级菜单</a></li>
                    <li><a href="#"><b>一级菜单</b></a></li>
                    <li><a href="#">一级菜单</a></li>
                    <li>
                        <a href="#">一级菜单</a>
                        <ul>
                            <li><a href="#">二级菜单</a></li>
                            <li><a href="#">二级菜单</a></li>
                        </ul>
                    </li>        
                      </ul>
                    </center>      
            </div>
        </body>
    </head>
</html>

The original code implementation below (there is a problem with the navigation layout when the page is zoomed in or out):

<html>
   <head>
       <style type="text/css">
        .top{
            /* 设置宽度高度背景颜色 */
            height: 50px;
            width:100%;
            background:rgb(189, 181, 181);
            position: fixed; /*固定在顶部*/
            top: 0;/*离顶部的距离为0*/
        }
        .top ul{
            /* 清除ul标签的默认样式 */
            width: 80%;
            list-style-type: none;
            margin: 0;            
            padding: 0;
            overflow: hidden;

        }
        .top li {    
            float:left; /* 使li内容横向浮动，即横向排列  */
            margin-right:50px;  /* 两个li之间的距离*/
        }

        .top li a{
           /* 设置链接内容显示的格式*/
            display: block; /* 把链接显示为块元素可使整个链接区域可点击 */
            color:white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none; /* 去除下划线 */
        }
        .top li a:hover{
            /* 鼠标选中时背景变为黑色 */
            background-color: #111;
        }
        .top ul li ul{
            /* 设置二级菜单 */
            width: auto;
            background:rgb(189, 181, 181);
            position: absolute;
            display: none; /* 默认隐藏二级菜单的内容 */

        }
        .top ul li ul li{
            /* 二级菜单li内容的显示 */
            margin-right:0;
            float:none;
            text-align: center;
        }
        .top ul li:hover ul{
            /* 鼠标选中二级菜单内容时 */
            display: block;
        }
       </style>
        <body>
            <div class="top">
                   <center> 
                    <ul>
                    <li><a href="#">一级菜单</a></li>
                    <li><a href="#">一级菜单</a></li>
                    <li><a href="#">一集菜单</a></li>
                    <li><a href="#"><b>一级菜单</b></a></li>
                    <li><a href="#">一级菜单</a></li>
                    <li>
                        <a href="#">一级菜单</a>
                        <ul>
                            <li><a href="#">二级菜单</a></li>
                            <li><a href="#">二级菜单</a></li>
                        </ul>
                    </li>        
                      </ul>
                    </center>      
            </div>
        </body>
    </head>
</html>

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