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如何使用html+css+js实现导航栏滚动渐变效果

时间:2024-7-24 11:46     作者:韩俊     分类: Javascript


本篇内容主要讲解“如何使用html+css+js实现导航栏滚动渐变效果”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“如何使用html+css+js实现导航栏滚动渐变效果”吧!

    实现:

    1.定义导航栏的文字标签:

    <div class="tou">
            <sapn class="logo"> 北极光。</sapn>
            <ul class="biao">
            <li><a href="https://www.maopiaopiao.com">

    2.导航栏整体的样式:

     .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:

     .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:

     .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,样式等都不做详细说明了,毕竟每个人的都不一样~:

    .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:

     .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:

    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:

     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, &hellip;) 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, &hellip;) 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,当滚动>0就强制添加.biao类,当滚动<=0就移除.biao类;

    完整代码:

    <!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>
    
       <!--  导航栏 -->
        <div class="tou">
            <sapn class="logo"> 北极光。</sapn>
            <ul class="biao">
            <li><a href="https://www.maopiaopiao.com">

    标签: javascript

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