菜单打开后关闭时页面冻结问题及现有JS下的关闭实现咨询

问题说明 #

开发的菜单点击关闭按钮（X）后页面冻结，删除原有JS函数后菜单打开不再卡顿，但失去关闭功能。

问题原因 #

现有JS仅为汉堡图标（#hamburger-icon）绑定了菜单切换事件，关闭按钮（#closebtn）未绑定任何点击逻辑；同时关闭按钮是<a>标签但未设置有效href，点击时触发浏览器默认锚点行为，导致页面出现冻结假象。

修复代码 #

修改后的JavaScript #

$(document).ready(function() {
  const hamburger = $('#hamburger-icon');
  const closeBtn = $('#closebtn');
  const nav = $('.canvas');

  // 汉堡按钮点击事件
  hamburger.click(function(e) {
    e.preventDefault();
    nav.toggleClass('shown');
    hamburger.toggleClass('active');
  });

  // 关闭按钮点击事件
  closeBtn.click(function(e) {
    e.preventDefault();
    nav.removeClass('shown');
    hamburger.removeClass('active');
  });
});

原有CSS（无需修改） #

body,
html {
  overflow: hidden;
}

body {
  font-family: 'Montserrat', sans-serif;
  height: 100%;
  margin: 0;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: 0.0625em;
  background-image: url("https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/Paracas_National_Reserve%2C_Ica%2C_Peru-3April2011.jpg/1600px-Paracas_National_Reserve%2C_Ica%2C_Peru-3April2011.jpg");
}

.menuaperto .card {
  margin: 1rem;
}

.menuaperto {
  margin-top: 20rem;
}

@media (min-width:800px) {
  .menuaperto {
    margin-top: 28rem;
  }
}

.minemenu {
  padding: 1rem;
  color: whitesmoke;
}

.separatore {
  padding-left: 5px;
  padding-right: 5px;
}

.bi-bag {
  margin-right: 12px;
  font-size: 20px;
}

.bi-heart {
  font-size: 20px;
}

.bi-person {
  font-size: 20px;
}

.bi-list {
  margin-right: 12px;
  font-size: 25px;
}

.bi-x {
  margin-right: 14px;
  font-size: 25px;
}

.minemenu a {
  text-decoration: none;
  color: whitesmoke;
  font-size: 18px;
}

#menumio {
  background-color: transparent;
}

.menu {
  font-family: 'Cormorant Garamond', serif;
  color: #c0a680;
  font-size: 23px;
}

.shop {
  font-family: 'Cormorant Garamond', serif;
  color: #c0a680;
  font-size: 20px;
}

@media(max-width:550px) {
  .nascondi {
    display: none!important;
  }
  .minemenu a {
    font-size: 16px;
    line-height: 3px;
  }
}

.canvas {
  padding: 1rem;
  color: whitesmoke;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: #303030;
  position: fixed;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: all 0.2s;
  z-index: 10;
  text-align: center;
}

.canvas.shown {
  top: 0;
  opacity: 1;
  max-height: none;
  z-index: 10;
}

.canvas a {
  text-decoration: none;
  color: whitesmoke;
  font-size: 18px;
}

.canvas .separatore {
  padding-left: 5px;
  padding-right: 5px;
}

@media(max-width:550px) {
  .canvas a {
    font-size: 16px;
    line-height: 3px;
  }
  .bi-x {
    margin-right: 8px;
    margin-left: -15px;
  }
}

原有HTML（无需修改） #

<!--BOOTSTRAP-->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="https://getbootstrap.com/docs/5.2/assets/css/docs.css" rel="stylesheet">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.2/font/bootstrap-icons.css">

<!--MYSTILE-->
<link href="style.css" rel="stylesheet" type="text/css">

<!--GOOGLE FONT-->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=La+Belle+Aurore&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap" rel="stylesheet">


<!--APERTURA MENU'-->
<nav class="canvas">
  <div class="container">
    <div class="row">
      <div class="col-4 d-flex">
        <a id="closebtn"><i class="bi bi-x"></i></a><span class="menu"><i>Menù</i></span>
      </div>
      <div class="col-4">
        <a href="#">
          <font style="font-weight: 600;">Brand</font> Name</a>
      </div>
      <div class="col-4 d-flex justify-content-end">
        <i class="bi bi-bag"></i><span class="shop"><i>Shop</i></span>
        <span class="separatore nascondi">|</span>
        <i class="bi bi-person mx-1 nascondi"></i>
        <span class="separatore nascondi">|</span>
        <i class="bi bi-heart mx-1 nascondi"></i>

      </div>
    </div>

  </div>


</nav>
<!--CHIUSURA MENU'-->



<nav id="menumio">
  <div class="container text-center minemenu">
    <div class="row">
      <div class="col-4 d-flex">
        <a id="hamburger-icon" href="#"><i class="bi bi-list"></i></a><span class="menu"><i>Menù</i></span>
      </div>
      <div class="col-4">
        <a href="#">
          <font style="font-weight: 600;">Brand</font> Name</a>
      </div>
      <div class="col-4 d-flex justify-content-end">
        <i class="bi bi-bag"></i><span class="shop"><i>Shop</i></span>
        <span class="separatore nascondi">|</span>
        <i class="bi bi-person mx-1 nascondi"></i>
        <span class="separatore nascondi">|</span>
        <i class="bi bi-heart mx-1 nascondi"></i>

      </div>
    </div>
  </div>
</nav>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.4.1/jquery.easing.min.js"></script>

修复说明 #

1. 为关闭按钮（#closebtn）绑定点击事件，触发菜单隐藏逻辑：移除.shown类，同时移除汉堡按钮的.active类
2. 使用e.preventDefault()替代return false，精准阻止<a>标签的默认跳转行为，避免页面冻结假象
3. 缓存DOM元素选择器，提升代码执行效率

内容的提问来源于stack exchange，提问作者Elia d'Albenzio