我只是想学习 jQuery 和 JavaScript。我开始有了概念，我觉得现实世界的问题是最好的学习方式。
我下载了 One Page Wonder Bootstrap模板，我只是想找到导航的 outerHeight 并在警报中调用以像素为单位的高度。
我试图用这个找到高度:
$('nav').outerHeight();
然后我尝试了几种方法来提醒该高度:
alert(nav);
alert('nav');
alert($(nav));
alert($(nav));
我知道这可能真的很简单，但这行不通。我需要使它成为一个功能吗？
这是 HTML，但我不确定是否需要它。它使用标准导航。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="">
<title>One Page Wonder - Start Bootstrap Template</title>
<!-- Bootstrap core CSS -->
<link href="vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<script src="vendor/jquery/jquery.min.js"></script>
<!-- Custom fonts for this template -->
<link href="https://fonts.googleapis.com/css?family=Catamaran:100,200,300,400,500,600,700,800,900" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Lato:100,100i,300,300i,400,400i,700,700i,900,900i" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="css/one-page-wonder.min.css" rel="stylesheet">
<script src="js/one-page-wonder.js"></script>
</head>
<body>
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark navbar-custom fixed-top">
<div class="container">
<a class="navbar-brand" href="#">Start Bootstrap</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="#">Sign Up</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Log In</a>
</li>
</ul>
</div>
</div>
</nav>
<header class="masthead text-center text-white">
<div class="masthead-content">
<div class="container">
<h1 class="masthead-heading mb-0">One Page Wonder</h1>
<h2 class="masthead-subheading mb-0">Will Rock Your Socks Off</h2>
<a href="#" class="btn btn-primary btn-xl rounded-pill mt-5">Learn More</a>
</div>
</div>
<div class="bg-circle-1 bg-circle"></div>
<div class="bg-circle-2 bg-circle"></div>
<div class="bg-circle-3 bg-circle"></div>
<div class="bg-circle-4 bg-circle"></div>
</header>
<section>
<div class="container">
<div class="row align-items-center">
<div class="col-lg-6 order-lg-2">
<div class="p-5">
<img class="img-fluid rounded-circle" src="img/01.jpg" alt="">
</div>
</div>
<div class="col-lg-6 order-lg-1">
<div class="p-5">
<h2 class="display-4">For those about to rock...</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quod aliquid, mollitia odio veniam sit iste esse assumenda amet aperiam exercitationem, ea animi blanditiis recusandae! Ratione voluptatum molestiae adipisci, beatae obcaecati.</p>
</div>
</div>
</div>
</div>
</section>
<section>
<div class="container">
<div class="row align-items-center">
<div class="col-lg-6">
<div class="p-5">
<img class="img-fluid rounded-circle" src="img/02.jpg" alt="">
</div>
</div>
<div class="col-lg-6">
<div class="p-5">
<h2 class="display-4">We salute you!</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quod aliquid, mollitia odio veniam sit iste esse assumenda amet aperiam exercitationem, ea animi blanditiis recusandae! Ratione voluptatum molestiae adipisci, beatae obcaecati.</p>
</div>
</div>
</div>
</div>
</section>
<section>
<div class="container">
<div class="row align-items-center">
<div class="col-lg-6 order-lg-2">
<div class="p-5">
<img class="img-fluid rounded-circle" src="img/03.jpg" alt="">
</div>
</div>
<div class="col-lg-6 order-lg-1">
<div class="p-5">
<h2 class="display-4">Let there be rock!</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quod aliquid, mollitia odio veniam sit iste esse assumenda amet aperiam exercitationem, ea animi blanditiis recusandae! Ratione voluptatum molestiae adipisci, beatae obcaecati.</p>
</div>
</div>
</div>
</div>
</section>
<!-- Footer -->
<footer class="py-5 bg-black">
<div class="container">
<p class="m-0 text-center text-white small">Copyright © Your Website 2018</p>
</div>
<!-- /.container -->
</footer>
<!-- Bootstrap core JavaScript -->
<script src="vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
</body>
</html>
最佳答案
将您的 $('nav').outerHeight() 分配到一个变量中，然后稍后尝试使用它...要获取以像素为单位的值，只需将它连接在变量的末尾变量。
var nav = $('nav').outerHeight();
console.log(nav + 'px');<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<nav class="navbar navbar-expand-lg navbar-dark bg-dark navbar-custom fixed-top">
<div class="container">
<a class="navbar-brand" href="#">Start Bootstrap</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"><span class="navbar-toggler-icon"></span></button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="#">Sign Up</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Log In</a>
</li>
</ul>
</div>
</div>
</nav>关于javascript - 在 jQuery 中查找高度，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48837836/