在没有使用Bootstrap的情况下，我没有在谷歌上找到任何关于此事的内容，在我的项目中我并不想这样做。 （因为我是一个初学者，我决定从一个香草项目开始 - 只有css html和js，主要是因为当我开始构建这个时，我甚至不知道什么是bootstrap）。 那么我如何在滚动时使白色（id：top-mare + logo）导航栏固定和收缩？
HTML
<!DOCTYPE html>
<html lang="en-us" class="no-js">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Best DAVNIC73</title>
<link href="css/css.css" rel="stylesheet" />
<link href="css/sshow.css" rel="stylesheet" />
<link href="css/mqueries.css" rel="stylesheet" />
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
</head>
<body>
<div id="container">
<div class="shadow">
<header id="top">
<nav id="top-mic">
<ul>
<li><a href="#">Contact</a></li>
<li><a href="#">Despre noi</a></li>
<li><a href="#">Locatie</a></li>
</ul>
</nav>
<a href="#"><img src="img/logo.jpg" alt="davnic" id="logo"></img></a>
<div id="top-mare-wrap">
<nav id="top-mare">
<ul>
<li><a href="#">Acasa</a></li>
<li><a href="#">Buton1</a></li>
<li><a href="#">Buton2</a></li>
<li><a href="#">Buton3</a></li>
<li><a href="#">Buton4</a></li>
</ul>
</nav>
</div>
</header>
</div>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="img/img1.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="img/img2.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="img/img3.jpg" style="width:100%">
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
<script src="js/sshow.js"></script>
<button onclick="topFunction()" id="myBtn" title="Inapoi la inceputul paginii"><img src="img/arrow-up-01-128.jpg"/></button>
<script src="js/myBtn.js"></script>
<footer class="footer">
<ul>
<li id="nume">SC Best DAVNIC73 SRL</li>
<li><img src="img/location_1.png" class="location"/> Judet Dambovita, Oras Targoviste, Strada, Nr</li>
<li><img src="img/phone.jpg" class="phone"/>074 44 44 444</li>
<li><img src="img/mail.jpg" id="mail"/>bestdavnic73@gmail.com</li>
<li class="copyright">Copyright Ⓒ 2017</li>
</ul>
</footer>
</div>
</div>
</body>
</html>
CSS
html {
box-sizing: border-box;
height: 100%;
font-family: Roboto, Arial;
}
*,
*:before,
*:after {
box-sizing: inherit;
}
body {
font-family: Roboto, Arial;
height: auto;
width: 100%;
padding: 0;
padding-bottom: 6vw;
margin: 0;
font-size: 1.1vw;
min-height: 100%;
position: relative;
}
header {
color: #ffffff;
padding: 0;
margin: 0;
border-bottom: 1px solid #ADADAD;
}
#container {
margin: 0 auto;
padding: 0;
color: #ffffff;
}
#top-mic {
background-color: #F28A00;
margin: 0;
padding: 0;
margin-bottom: 0.73vw;
}
#top-mic ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
}
#top-mic li {
float: right;
padding: 0.416vw 1.5625vw;
}
#top-mic li a {
display: block;
text-decoration: none;
color: #ffffff;
text-align: center;
font-size: 0.6vw;
font-weight: bold;
transition: color 0.25s ease;
margin-right: 2.8645vw;
}
#top-mic li a:hover {
color: #ADADAD;
}
#logo {
max-width: 100%;
float: left;
margin-left: 12.5vw;
margin-right: 6.77vw;
width:15vw;
height: auto !important;
}
#top-mare-wrap {
margin: 0 auto;
}
#top-mare {
padding: 0;
margin: 0;
margin-bottom: 3.125vw;
}
#top-mare ul {
list-style-type: none;
margin: 0;
padding: 0;
}
#top-mare li {
display: inline;
}
#top-mare li a {
margin-top: 2.1875vw;
margin-left: 2.083vw;
padding-right: 1.041vw;
display: inline-block;
text-decoration: none;
color: #ADADAD;
text-align: center;
font-size: 2.1vw;
font-weight: bold;
transition: color 0.25s ease;
}
#top-mare li a:hover {
color: #F28A00;
}
#test {
color:black;
}
.footer {
position: fixed;
right: 0;
bottom: 0;
left: 0;
background-color: #F28A00;
}
.footer ul {
list-style-type: none;
margin: 0;
padding: 1.041vw;
}
.footer li {
font-size: 0.9vw;
font-weight:bold;
display: inline;
margin-left: 2.604vw;
padding-right: 0.78125vw;
padding-bottom: 0.263vw;
}
.copyright {
float:right;
}
#nume {
font-weight: italic;
}
#myBtn {
display: none;
position: fixed;
bottom: 3.646vw;
left: 3.125vw;
z-index: 99;
border: none;
outline: none;
background-color: #F28A00;
color: white;
cursor: pointer;
padding: 0.78125vw;
border-radius: 10px;
width: 3.33333vw;
height: 3.3333vw;
}
.location {
width: 0.677vw;
height: 0.677vw;
}
.phone {
width: 0.677vw;
height: 0.677vw;
}
#mail {
height: 0.677vw;
width: 0.9375vw;
}
答案 0 :(得分：0)
要创建缩小动画，我建议你使用CSS过渡和jQuery addClass。
所以，你要从顶部测量滚动位置。当需要高度时，添加包含缩小值的CSS类到该元素。
例如，您的徽标包含“＆＃39;徽标＆＃39;：
”<img src="image/logo.jpg" class="logo"/>
Logo CSS：
.logo {
width: 200px;
transition: all .5s ease-in-out;
}
您要添加/删除的课程称为例如。 ＆＃39;收缩＆＃39 ;.它具有缩小值（例如，您希望缩小的徽标宽度为125px）：
.logo.shrink {
width: 125px;
}
接下来在需要时将徽标添加到徽标（在此示例中从顶部70px）。
$(document).on('scroll', function() {
if ($(this).scrollTop > 70) {
$('.logo').addClass('shrink');
} else if ($(this).scrollTop < 70) {
$('.logo').removeClass('shrink');
}
});