Javascript 为什么'；这个JQuery函数不能工作吗？（向下滚动时使导航栏透明）_Javascript_Jquery_Html_Css

Javascript 为什么'；这个JQuery函数不能工作吗？（向下滚动时使导航栏透明）

javascript jquery html css

Javascript 为什么'；这个JQuery函数不能工作吗？（向下滚动时使导航栏透明）,javascript,jquery,html,css,Javascript,Jquery,Html,Css,我一直在学习教程。我无法理解为什么我的JQuery函数都不起作用。我向下滚动，什么也没发生。我的所有文件都已正确链接和引用。我试图改变javascript，所以滚动50px将改变不透明度，但仍然没有工作。请帮忙谢谢你抽出时间 index.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" conte

我一直在学习教程。我无法理解为什么我的JQuery函数都不起作用。我向下滚动，什么也没发生。我的所有文件都已正确链接和引用。我试图改变javascript，所以滚动50px将改变不透明度，但仍然没有工作。请帮忙

谢谢你抽出时间

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/all.min.css" integrity="sha256-mmgLkCYLUQbXn0B1SRqzHar6dCnv9oZFPEC1g1cwlkk=" crossorigin="anonymous" />
    <link rel="stylesheet" href="css/style.css">
    <link rel="stylesheet" media="screen and (max-width: 768px)" href="css/mobile.css.css">
        <link rel="stylesheet" media="screen and (min-width: 1100px)" href="css/widescreen.css">

    <title>EdgeLedger Financial | Accounting & Investment</title>
</head>
<body>

    <nav id="navbar">
        <h1 class="logo">
            <span class="text-primary">
                <i class="fas fa-book-open"></i> Edge
            </span>Ledger
        </h1>

        <ul>
            <li class="a" href="#"><a>Home</a></li>
            <li class="a" href="#"><a>What</a></li>
            <li class="a" href="#"><a>Who</a></li>
            <li class="a" href="#"><a>Contact</a></li>
        </ul>

    </nav>

    <!-- Showcase-->

<header id="showcase">
    <div class="showcase-content">
        <h1 class="l-heading">
            The Sky Is The Limit
        </h1>
        <p class="lead">
            Lorem, ipsum dolor sit amet consectetur adipisicing elit. Doloremque, quidem nostrum blanditiis eaque voluptatum dignissimos?
        </p>
        <a href="" id="what" class="btn">Read More</a>

    </div>
</header>    

<!-- Section: What We Do-->
<section id="what" class="bg-light py-1">
    <div class="container">
        <h2 class="m-heading text-center"><span class="text-primary">What</span> We Do</h2>

        <div class="items">
            <div class="item">
                <i class="fas fa-university fa-2x"></i>
                <div>
                   <h3>Investment Banking</h3>
                    <p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Architecto ex eius sed? Eius, accusamus nobis!</p>
                </div>
            </div>
            <div class="item">
                <i class="fas fa-book-reader fa-2x"></i>
                <div>
                   <h3>Portfolio Management</h3>
                    <p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Architecto ex eius sed? Eius, accusamus nobis!</p>
                </div>
            </div>
            <div class="item">
                <i class="fas fa-pencil-alt fa-2x"></i>
                <div>
                   <h3>Tax & Custodial</h3>
                    <p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Architecto ex eius sed? Eius, accusamus nobis!</p>
                </div>
            </div>
        </div>
    </div>
</section>

<!-- Section: Who We are-->
<section id="who">
    <div class="who-img"></div>
    <div class="who-text bg-dark p-2">
        <h2 class="m-heading"><span class="text-primary">Who</span> We Are </h2><p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Accusantium sapiente fugiat ab minus, sunt amet itaque id cupiditate inventore tempora.</p>
        <h3>Our Team</h3>
        <ul class="list">
            <li>Mark Smith: CEO</li>
            <li>Shannon Johnson: CFO</li>
            <li>John Corbit: Lead Accountant</li>
            <li>Janet Williams: Investment Manager</li>
            <li>Kara Jackson: Senior Accountant</li>
        </ul>
    </div>
</section>

<!-- Section: Clients-->
<section id="clients" class="py-1">
    <div class="container">
        <h2 class="m-heading text-center">
            <span class="text-primary">Our</span>
            Clients
        </h2>
    </div>
    <div class="items py1">
        <div><img src="./img/logos/logo1.png" alt="Client"></div>
        <div><img src="./img/logos/logo2.png" alt="Client"></div>
        <div><img src="./img/logos/logo3.png" alt="Client"></div>
        <div><img src="./img/logos/logo4.png" alt="Client"></div>
        <div><img src="./img/logos/logo5.png" alt="Client"></div>
    </div>

</section>

<!-- Section: Contact-->
<section id="contact">
    <div class="contact-form bg-primary p-2">
        <h2 class="m-heading">Contact Us</h2>
        <p>Please use the form below to contact us</p>
        <form>
            <div class="form-group">
                <label for="name">Name</label>
                <input type="text" name="name" id="name" placeholder="Enter Name">
            </div>
            <div class="form-group">
                <label for="name">Email</label>
                <input type="email" name="email" id="email" placeholder="Enter Email">
            </div>
            <div class="form-group">
                <label for="name">Phone Number</label>
                <input type="text" name="phone" id="phone" placeholder="Enter Phone Number">
            </div>
            <div class="form-group">
                <label for="message">Message</label>
                <textarea name="name" id="name" width="100%" placeholder="Enter Message"></textarea>
            </div>
            <input type="submit" value="Send" class="btn btn-dark">
        </form>
    </div>
    <div class="map">

    </div>
</section>

<!-- Footer -->
<footer id="main-footer">
    <div class="container">
        <p>Copyright &copy; 2020 EdgeLedger All Rights Reserved</p>
    </div>

</footer>

<!-- JQuery CDN -->
<script 
  src="https://code.jquery.com/jquery-3.4.1.js"
  integrity="sha256-WpOohJOqMqqyKL9FccASB9O0KwACQJpFTUBLTYOVvVU="
  crossorigin="anonymous">
</script>

<!-- Local JS File -->
<script src="js/main.js"></script>

<!-- Google Maps -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAWwjIowcgGZxjQzSS1VlE_PtwSPrN0XJs&callback=initMap"
async defer></script>

</body>
</html>

main.js

var map;
function initMap() {
    const loc = { lat: 42.361145, lng: -71.057083 };
    const map = new google.maps.Map(document.querySelector('.map'), {
        zoom: 14,
        center: loc
    });

    const marker = new google.maps. Marker({position: loc, map: map});
}

// Sticky menu background

window.addEventListener ('scroll', function() {
    if (window.scrollY > 150) {
        document.querySelector('#navbar')style.opacity = 0.2;
    } else {
        document.querySelector('#navbar').style.opacity = 1;
    }
});

// Smooth Scrolling

$('#navbar a, .btn').on('click', function(event) {
    if (this.hash !== '') {
      event.preventDefault();

      const hash = this.hash;

      $('html, body').animate(
        {
          scrollTop: $(hash).offset().top - 100
        },
        800
      );
    }
  });

此行中缺少一个点：

document.querySelector('#navbar')style.opacity = 0.2;

（在“样式”之前）

您是否查看了浏览器开发人员控制台中是否有任何错误例如，

文档中缺少的
将使您的代码不运行
document.querySelector('#navbar')style.opacity = 0.2;