html+css+js实现导航栏滚动渐变

1.定义导航栏的文字标签：

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<div class="tou">
        <sapn class="logo"> 北极光。</sapn>
        <ul class="biao">
        <li><a href="#"><a href="#">主页</a></li>
        <li><a href="#">个人简介</a></li>
        <li><a href="#">文章</a></li>
        <li><a href="#">留言版</a></li>
        <li><a href="#">友链</a></li>
        </ul>
    </div>

2.导航栏整体的样式：

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.tou{
             position: fixed;
             top: 0;
             left: 0;
             padding: 25px 100px;
             width: 100%;
             display: flex;
             justify-content: space-between;
             align-items: center;
            transition:  0.5s;
         }

transition 过渡效果
3.北极光这个logo的样式：

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.logo{
            position: relative;
            font-size: 22px;
            font-weight: 900;
            letter-spacing: 1px;
            color: rgb(28, 36, 148);
        }

letter-spacing:文字（字母）间距

4.给北极光logo定位一个图片在文字左边：

 

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.logo::before{
            content: '';
            position: absolute;
            left: -50px;
            top: -15px;
            width: 50px;
            height: 50px;
            background-image: url(logo.png);
            background-size: 100%;
         }

5.右边导航标签的一些样式，@ www.xuepai.net样式等都不做详细说明了，毕竟每个人的都不一样~：

 

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.biao{
             position: relative;
             display: flex;
             justify-content: center;
             align-content: center;
            list-style: none;
             
         }
        .biao li{
             position: relative;
         }
        .biao a{
             position: relative;
             margin: 0 10px;
             font-size: 18px;
             font-family: 'fangsong';
             font-weight: bold;
             color: rgb(28, 36, 148);
             text-decoration: none;
 
         }

6.当页面有滚动后导航栏的样式，padding上下变小，字体颜色变，有了蓝背景色：

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.bian{
           padding: 15px 100px;
           background-color: rgb(71, 105, 219);
       }
       .bian .logo,.tou.bian a{
           color: rgb(252, 247, 247);
       }

7.简单js，实现部分：
第一种：

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window.addEventListener('scroll',function(){
            let tou = document.querySelector('.tou');
           if(window.scrollY>0)
            {
                tou.classList.add("bian");
            }else{
                tou.classList.remove("bian");
            }
        })

第二种：直接这样：

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window.addEventListener('scroll',function(){
            let tou = document.querySelector('.tou');   
            tou.classList.toggle("bian",window.scrollY>0);
 
        })

解释：
scrollY属性：
Window接口的只读scrollY属性返回文档当前垂直滚动的像素数。

classList属性：
add(class1, class2, …) 在元素中添加一个或多个类名。如果指定的类名已存在，则不会添加；
remove(class1, class2, …) 移除元素中一个或多个类名。
toggle(class, true|false) 第一个参数为如果已存在类名则中移除的类名，并返回 false。如果该类名不存在则会在元素中添加类名，并返回 true。第二个是可选参数，是个布尔值用于设置元素是否强制添加或移除类，不管该类名是否存在。

所以：
第一种js写法就是有滚动>0时就添加类.biao而实现渐变效果，当滚动<=0时就移除.biao类回到原来；
第二种就是布尔值判断，@ www.haoshilao.net当滚动>0就强制添加.biao类，当滚动<=0就移除.biao类；

完整代码：

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            box-sizing: border-box;
             
        }
        body{
            height: 200vh;
             
        }
        .tou{
             position: fixed;
             top: 0;
             left: 0;
             padding: 25px 100px;
             width: 100%;
             display: flex;
             justify-content: space-between;
             align-items: center;
            transition:  0.5s;
         }
        .logo{
             position: relative;
             font-size: 22px;
             font-weight: 900;
             letter-spacing: 1px;
             color: rgb(28, 36, 148);
         }
         .logo::before{
            content: '';
            position: absolute;
            left: -50px;
            top: -15px;
            width: 50px;
            height: 50px;
            background-image: url(logo.png);
            background-size: 100%;
         }
         .biao{
             position: relative;
             display: flex;
             justify-content: center;
             align-content: center;
            list-style: none;
             
         }
        .biao li{
             position: relative;
         }
        .biao a{
             position: relative;
             margin: 0 10px;
             font-size: 18px;
             font-family: 'fangsong';
             font-weight: bold;
             color: rgb(28, 36, 148);
             text-decoration: none;
 
         }
           
        .bian{
            padding: 15px 100px;
            background-color: rgb(71, 105, 219);
        }
        .bian .logo,.tou.bian a{
            color: rgb(252, 247, 247);
        }
       /*  背景图样式 */
        .bjimg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      min-width: 1000px;
      z-index: -10;
      zoom: 1;
      background-color: #fff;
      background-image: url(11.jpg) ;
      background-repeat: no-repeat;
      background-size: cover;
      -webkit-background-size: cover;
      -o-background-size: cover;
      background-position: center 0;
    }
 
    </style>
</head>
<body>
    <!-- 背景图 -->
    <div class="bjimg"></div>
 
   <!--  好问提示导航栏 -->
    <div class="tou">
        <sapn class="logo"> 北极光。</sapn>
        <ul class="biao">
        <li><a href="#"><a href="#">主页</a></li>
        <li><a href="#">个人简介</a></li>
        <li><a href="#">文章</a></li>
        <li><a href="#">留言版</a></li>
        <li><a href="#">友链</a></li>
        </ul>
    </div>
    <script>
        window.addEventListener('scroll',function(){
            let tou = document.querySelector('.tou');
             
            
           /*  tou.classList.toggle("bian",window.scrollY>0); */
           if(window.scrollY>0)
            {
                tou.classList.add("bian");
            }else{
                tou.classList.remove("bian");
            }
        })
    </script>
</body>
</html>

 

posted @ 2026-01-06 20:22  zxcva  阅读(15)  评论(0)    收藏  举报