滚动和移动视图中导航栏显示不正确

Question

我的导航栏有问题。当它位于顶部时，它应该是透明的，并且一旦用户滚动一点，导航栏的背景就会变为白色，字体颜色变为黑色。这也适用于移动视图。 菜单的图标不显示为黑色，如果我在顶部（导航栏为透明颜色），那么移动菜单也会正确显示，但如果我向下滚动一点并且移动导航栏显示在白色，移动导航栏显示为黑色字体，不应该这样。我该如何解决这个问题？

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顶部透明的导航栏

导航栏滚动并显示为白色

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移动视图 顶部透明的移动导航栏

顶部透明的移动导航栏和打开菜单时

导航栏滚动并显示为白色

导航栏滚动并显示为白色，然后您打开菜单

菜单栏应与上图完全相同，图标应为黑色，如图 4 所示

---

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代码

Navbar.js

import React, { useState, useEffect } from "react";
import { Button } from "../buttons/Button";
import { Link } from "react-router-dom";
import "./Navbar.css";

function Navbar() {
  const [click, setClick] = useState(false);
  const [button, setButton] = useState(true);
  const [navbar, setNavbar ] = useState(false);

  const handleClick = () => setClick(!click);
  const closeMobileMenu = () => setClick(false);

  const showButton = () => {
    if (window.innerWidth <= 960) {
      setButton(false);
    } else {
      setButton(true);
    }
  };

  useEffect(() => {
    showButton();
  }, []);

  window.addEventListener("resize", showButton);

  const changeBackground = () => {
    if(window.scrollY >= 80) {
        setNavbar(true);
    }
    else {
        setNavbar(false);
    }
};

window.addEventListener('scroll', changeBackground);



  return (
    <>
      <nav className={navbar ? 'navbar active' : 'navbar'}>
        <div className="navbar-container">
          <Link to="/" className={navbar ? 'navbar-logo active' : 'navbar-logo'} onClick={closeMobileMenu}>
            NAME
            <i class="fab fa-typo3" />
          </Link>
          <div className="menu-icon" onClick={handleClick}>
            <i className={click ? "fas fa-times" : "fas fa-bars"} />
          </div>
          <ul className={click ? "nav-menu active" : "nav-menu"}>
            <li className="nav-item">
              <Link to="/" className={navbar ? 'nav-links active' : 'nav-links'} onClick={closeMobileMenu}>
                Text 1
              </Link>
            </li>
            <li className="nav-item">
              <Link
                to="/"
                className={navbar ? 'nav-links active' : 'nav-links'}
                onClick={closeMobileMenu}
              >
                Text 2
              </Link>
            </li>
            <li className="nav-item">
              <Link
                to="/"
                className={navbar ? 'nav-links active' : 'nav-links'}
                onClick={closeMobileMenu}
              >
                Text 3
              </Link>
            </li>

            <li>
              <Link
                to="/"
                className="nav-links-mobile"
                onClick={closeMobileMenu}
              >
                BUTTON
              </Link>
            </li>
          </ul>
          {button && <Button buttonStyle="btn--primary">BUTTON</Button>}
        </div>
      </nav>
    </>
  );
}

export default Navbar;

Navbar.css

.navbar {
    /*background: #2b41cb;*/
    background: transparent;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    position: sticky;
    top: 0;
    z-index: 999;
    margin-bottom: -80px;
  }
 

  .navbar-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 80px;
    max-width: 1500px;
  }

  
  
  .navbar-logo {
    color: #fff;
    justify-self: start;
    margin-left: 20px;
    cursor: pointer;
    text-decoration: none;
    font-size: 2rem;
    display: flex;
    align-items: center;
  }

  
  .fa-typo3 {
    margin-left: 0.5rem;
    font-size: 1.8rem;
  }
  
  .nav-menu {
    display: grid;
    grid-template-columns: repeat(4, auto);
    grid-gap: 10px;
    list-style: none;
    text-align: center;
    width: 60vw;
    justify-content: end;
    margin-right: 2rem;
  }
  
  .nav-item {
    height: 80px;
  }
  
  .nav-links {
    color: #fff;
    display: flex;
    align-items: center;
    text-decoration: none;
    padding: 0.5rem 1rem;
    height: 100%;
  }
  
  .nav-links:hover {
    border-bottom: 4px solid #fff;
    transition: all 0.2s ease-out;
  }
  
  .fa-bars {
    color: #fff;
  }
  
  .nav-links-mobile {
    display: none;
  }
  
  .menu-icon {
    display: none;
  }
  
  @media screen and (max-width: 960px) {
    .NavbarItems {
      position: relative;
    }
  
    .nav-menu {
      display: flex;
      flex-direction: column;
      width: 100%;
      height: 90vh;
      position: absolute;
      top: 80px;
      left: -100%;
      opacity: 1;
      transition: all 0.5s ease;
    }
  
    .nav-menu.active {
      background: #242222;
      left: 0;
      opacity: 1;
      transition: all 0.5s ease;
      z-index: 1;
    }
  
    .nav-links {
      text-align: center;
      padding: 2rem;
      width: 100%;
      display: table;
    }
  
    .nav-links:hover {
      background-color: #fff;
      color: #242424;
      border-radius: 0;
    }
  
    .navbar-logo {
      position: absolute;
      top: 0;
      left: 0;
      transform: translate(25%, 50%);
    }
  
    .menu-icon {
      display: block;
      position: absolute;
      top: 0;
      right: 0;
      transform: translate(-100%, 60%);
      font-size: 1.8rem;
      cursor: pointer;
    }
  
    .fa-times {
      color: #fff;
      font-size: 2rem;
    }
  
    .nav-links-mobile {
      display: block;
      text-align: center;
      margin: 2rem auto;
      border-radius: 4px;
      width: 80%;
      text-decoration: none;
      font-size: 1.5rem;
      background-color: goldenrod;
      color: #fff;
      padding: 14px 20px;
      border: 1px solid goldenrod;
      transition: all 0.3s ease-out;
      border-radius: 25px;
    }
  
    .nav-links-mobile:hover {
      background: goldenrod;
      transition: 250ms;
    }
  }

  /* NAVBAR ACTIVE */
   
  .navbar.active {
    /*background: linear-gradient(90deg, rgb(66, 2, 194) 0%, rgb(0, 78, 194) 100%)*/
    background: #fff;
    border-bottom: 2px solid #e8e8e8;
  }
  

  .navbar-logo.active {
    color: #000;
  }


  .nav-links.active {
    color: #000;
  }

  .nav-links.active:hover {
    border-bottom: 4px solid #000;
    transition: all 0.2s ease-out;
  }

---

不是必须的，但要让它运行

HeroSection.js

import React from 'react';
import '../../App.css';
import { Button } from '../buttons/Button';
import './HeroSection.css';



function HeroSection() {



  return (
    <div className='hero-container'>
      <h1>Heading One</h1>
      <p>Some Text!</p>
      <div className='hero-btns'>
        <Button
          className='btns'
          buttonStyle='btn--outline'
          buttonSize='btn--large'
        >
          BUTTON 1
        </Button>
        <Button
          className='btns'
          buttonStyle='btn--primary'
          buttonSize='btn--large'
        >
          BUTTON 2 <i className='far fa-arrow-alt-circle-right' />
        </Button>
      </div>
    </div>
  );
}

export default HeroSection;

HeroSection.css

video {
    object-fit: cover;
    width: 100%;
    height: 100%;
    position: fixed;
    z-index: -1;
  }
  
  .hero-container {
    background: rgba(102, 232, 255, 0.849);
    height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    /*box-shadow: inset 0 0 0 1000px rgba(0, 0, 0, 0.2);*/
    object-fit: contain;
  }
  
  .hero-container > h1 {
    color: #fff;
    font-size: 100px;
    margin-top: -100px;
  }
  
  .hero-container > p {
    margin-top: 8px;
    color: #fff;
    font-size: 32px;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande',
      'Lucida Sans', Arial, sans-serif;
  }
  
  .hero-btns {
    margin-top: 32px;
  }
  
  .hero-btns .btn {
    margin: 6px;
  }
  
  .fa-play-circle {
    margin-left: 4px;
  }
  
  @media screen and (max-width: 960px) {
    .hero-container > h1 {
      font-size: 70px;
      margin-top: -150px;
    }
  }
  
  @media screen and (max-width: 768px) {
    .hero-container > h1 {
      font-size: 50px;
      margin-top: -100px;
    }
  
    .hero-container > p {
      font-size: 30px;
    }
  
    .btn-mobile {
      display: block;
      text-decoration: none;
    }
  
    .btn {
      width: 100%;
    }
  }

Home.js

import React from 'react';
import '../../App.css';
import Cards from '../cards/Cards';
import Footer from '../footer/Footer';
import HeroSection from '../Hero/HeroSection';
import Box from '../box/Box';

function Home() {
    return (
        <>
            <HeroSection></HeroSection>
            
        </>
    )
}

export default Home;

App.js

import React from 'react'
import Navbar from './components/navbar/Navbar'
import { BrowserRouter as Router, Switch, Route } from 'react-router-dom';
import Home from './components/pages/Home';
import './App.css'


function App() {
  return (
    <>
      <Router>
      <Navbar/>
      <Switch>
          <Route path='/' exact component={Home} />
      </Switch>
      </Router>
    </>
  );
}

export default App;

Answer 1

可能你需要不同的类来为你不同的导航按钮在不同的情况下动态添加它:)

Answer 2

window.addEventListener("resize", showButton);

  const changeBackground = () => {
     let scrollClass = '';
    if(window.scrollY >= 80) {
        setNavbar(true);
        scrollClass = 'black';
    }
    else {
        setNavbar(false);
        scrollClass = '';
    }
    this.setState({ scrollClass });

<div className="menu-icon" onClick={handleClick}>
     <i className={`click ? "fas fa-times" : "fas fa-bars" ${this.state.scrollClass }`} />
</div>