css+js实现支持暗黑主题切换的自适应头部导航菜单效果代码-html代码-BFW代码库

代码语言：html
代码描述：css+js实现支持暗黑主题切换的自适应头部导航菜单效果代码，支持多级显示、支持图片菜单项。
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
<link type="text/css" rel="stylesheet" href="//repo.bfw.wiki/bfwrepo/css/boxicons.min.css">

<style>
    :root {
  --white-100: hsl(206, 5%, 100%);
  --white-200: hsl(206, 5%, 90%);
  --white-300: hsl(206, 5%, 80%);
  --white-400: hsl(206, 5%, 65%);
  --white-500: hsl(206, 5%, 45%);
  --black-100: hsl(210, 21%, 12%);
  --black-200: hsl(210, 21%, 9%);
  --black-300: hsl(210, 21%, 6%);
  --black-400: hsl(210, 21%, 3%);
  --black-500: hsl(210, 21%, 1%);
  --night-100: hsl(217, 27%, 20%);
  --night-200: hsl(217, 27%, 16%);
  --night-300: hsl(217, 27%, 12%);
  --night-400: hsl(215, 27%, 8%);
  --night-500: hsl(215, 27%, 4%);
  --pink-100: hsl(326, 85%, 90%);
  --pink-200: hsl(327, 87%, 80%);
  --pink-300: hsl(329, 86%, 70%);
  --pink-400: hsl(330, 81%, 60%);
  --pink-500: hsl(333, 71%, 50%);
  --shadow-small: 0 1px 3px 0 rgba(0, 0, 0, 0.1),
     0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
     0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
     0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

*,
*::before,
*::after {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  list-style: none;
  list-style-type: none;
  text-decoration: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

html {
  font-size: 100%;
  box-sizing: inherit;
  scroll-behavior: smooth;
  height: -webkit-fill-available;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: clamp(1rem, calc(0.97rem + 0.14vw), 1.09rem);
  font-weight: normal;
  line-height: 1.5;
  color: var(--black-300);
  background-color: var(--white-100);
}
body.darkmode {
  color: var(--white-100);
  background-color: var(--night-400);
}

main {
  overflow: hidden;
}

a,
button {
  cursor: pointer;
  user-select: none;
  border: none;
  outline: none;
  background: none;
}

img,
video {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

img {
  image-rendering: -webkit-optimize-contrast;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

@keyframes slideLeft {
  0% {
    opacity: 0;
    transform: translateX(100%);
  }
  100% {
    opacity: 1;
    transform: translateX(0%);
  }
}
@keyframes slideRight {
  0% {
    opacity: 1;
    transform: translateX(0%);
  }
  100% {
    opacity: 0;
    transform: translateX(100%);
  }
}
.section {
  margin: 0 auto;
  padding: 6rem 0 2rem;
}

.container {
  max-width: 75rem;
  height: auto;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.centered {
  text-align: center;
  vertical-align: middle;
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  font-family: inherit;
  font-size: inherit;
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
  vertical-align: middle;
  white-space: nowrap;
  user-select: none;
  border-radius: 0.25rem;
  text-transform: capitalize;
  transition: all 0.3s ease;
}
.btn-primary {
  padding: 0.75rem 1.5rem;
  color: var(--white-100);
  background-color: var(--pink-500);
  box-shadow: var(--shadow-medium);
}
.btn-darken {
  padding: 0.75rem 1.5rem;
  color: var(--white-100);
  background-color: var(--night-300);
  box-shadow: var(--shadow-medium);
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
  z-index: 100;
  margin: 0 auto;
  background-color: var(--white-100);
  box-shadow: var(--shadow-medium);
}
.darkmode .header {
  background-color: var(--night-300);
}

.brand {
  font-family: inherit;
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--pink-500);
  text-transform: uppercase;
  order: 1;
}
.darkmode .brand {
  color: var(--pink-300);
}

.navbar {
  display: flex;
  flex-wrap: wrap;
  align-content: center;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 4rem;
  margin: 0 auto;
}
.navbar-left {
  display: flex;
  align-items: center;
  flex: 0 0 17%;
}
.navbar-center {
  display: flex;
}
.navbar-right {
  display: flex;
  flex: 0 0 17%;
  align-items: center;
  justify-content: flex-end;
  column-gap: 1.5rem;
}
@media only screen and (max-width: 992px) {
  .navbar-left, .navbar-right {
    flex: 0 0 auto;
  }
  .navbar-right {
    align-items: center;
  }
  .navbar-center {
    flex: 0 0 100%;
    order: 3;
    align-items: center;
  }
}

@media only screen and (max-width: 992px) {
  .menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 75%;
    height: 100%;
    z-index: 100;
    overflow: hidden;
    transform: translate(-100%);
    background-color: var(--white-100);
    transition: all 0.4s ease-in-out;
  }
  .menu.is-active {
    transform: translate(0%);
  }
  .darkmode .menu {
    background-color: var(--night-300);
  }
}

.menu-header {
  display: none;
  box-shadow: var(--shadow-medium);
}
.menu-item {
  display: inline-block;
  line-height: 1.5;
  padding-right: 1.25rem;
}
.menu-link {
  font-family: inherit;
  font-size: inherit;
  font-weight: 500;
  line-height: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--black-300);
  text-transform: capitalize;
  transition: all 0.25s ease;
}
.menu-link > i.bx {
  font-size: 1.35rem;
  margin-left: 0.25rem;
  transform: rotate(90deg);
}
.darkmode .menu-link {
  color: var(--white-100);
}
.menu-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 6px;
  font-size: 1.45rem;
  color: var(--black-300);
  transition: all 0.25s ease;
}
.darkmode .menu-icon {
  color: var(--white-100);
}
@media only screen and (min-width: 993px) {
  .menu-dropdown:hover > .submenu {
    opacity: 1;
    visibility: visible;
    margin-top: 1rem;
  }
}
@media only screen and (max-width: 992px) {
  .menu-header {
    position: relative;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    height: 4rem;
    z-index: 110;
    visibility: hidden;
    background: transparent;
  }
  .menu-header.is-active {
    visibility: visible;
    background-color: var(--white-100);
  }
  .menu-header.is-active > .menu-arrow {
    display: block;
  }
  .darkmode .menu-header.is-active {
    background-color: var(--night-100);
  }
  .menu-arrow {
    display: none;
    cursor: pointer;
    width: 3rem;
    height: 4rem;
    text-align: center;
  }
  .menu-arrow > i.bx {
    font-size: 1.5rem;
    line-height: 4rem;
    color: var(--black-300);
    transition: all 0.25s ease;
  }
  .darkmode .menu-arrow > i.bx {
    color: var(--white-100);
  }
  .menu-title {
    font-family: inherit;
    font-size: inherit;
    font-weight: 500;
    line-height: inherit;
    text-transform: capitalize;
    color: var(--black-300);
  }
  .darkmode .menu-title {
    color: var(--white-100);
  }
  .menu-inner {
    height: 100%;
    margin-top: -3rem;
    overflow-y: auto;
    overflow-x: hidden;
  }
  .menu-item {
    display: block;
    line-height: 1;
    padding-inline: 0;
  }
  .menu-link {
    justify-content: space-between;
    height: 2.5rem;
    line-height: 2.5rem;
    padding-inline: 1.25rem;
  }
  .menu-link > i.bx {
    margin-left: 0.5rem;
    transform: rotate(0deg);
  }
}

.submenu {
  position: absolute;
  width: 100%;
  height: auto;
  margin-top: 1.75rem;
  padding: 1rem 2rem;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  border-radius: 0.25rem;
  border-top: 2px solid var(--pink-400);
  background-color: var(--white-100);
  box-shadow: var(--shadow-medium);
  transition: all 0.25s ease-in-out;
}
.darkmode .submenu {
  border-top: 2px solid var(--pink-300);
  background-color: var(--night-300);
}
.submenu-inner {
  flex: 0 0 25%;
  padding: 0 1rem;
}
.submenu-title {
  font-family: inherit;
  font-size: inherit;
  font-weight: 500;
  line-height: 1;
  padding: 0.75rem 0;
  color: var(--pink-500);
  text-transform: uppercase;
  transition: all 0.3s ease;
}
.darkmode .submenu-title {
  color: var(--pink-300);
}
.submenu-item {
  display: block;
  line-height: 1;
  margin: 0 auto;
}
.submenu-link {
  display: inline-block;
  font-family: inherit;
  font-size: inherit;
  font-weight: 500;
  line-height: inherit;
  padding: 0.75rem 0;
  white-space: nowrap;
  text-transform: capitalize;
  color: var(--black-300);
  transition: all 0.25s ease-in-out;
}
.darkmode .submenu-link {
  color: var(--white-100);
}
.submenu-image {
  display: block;
  width: 100%;
  height: auto;
  margin-block: 0.5rem;
  object-fit: cover;
}
@media only screen and (max-width: 992px) {
  .submenu {
    position: absolute;
    display: none;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    max-width: none;
    min-width: auto;
    margin: 0;
    padding: 1rem;
    padding-top: 4rem;
    opacity: 1;
    overflow-y: auto;
    visibility: visible;
    box-shadow: none;
    transform: translateX(0%);
  }
  .submenu.is-active {
    display: block;
  }
  .submenu-inner {
    flex: 0 0 100%;
    padding: 0rem;
  }
  .submenu-list {
    margin-bottom: 1rem;
  }
  .submenu-link {
    display: block;
  }
  .submenu-image {
    margin-top: 0;
  }
}

.megamenu {
  left: 50%;
  width: 100%;
  height: auto;
  margin: 0 auto;
  transform: translateX(-50%);
}
.megamenu-column-1 {
  left: 65%;
  max-width: 15rem;
  width: 100%;
  height: auto;
}
.megamenu-column-4 {
  display: flex;
  flex-wrap: wrap;
  max-width: 62rem;
  height: auto;
  margin: 0 auto;
}
@media only screen and (max-width: 992px) {
  .megamenu {
    position: absolute;
    display: none;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    max-width: none;
    min-width: auto;
    margin: 0;
    padding: 1rem;
    padding-top: 4rem;
    opacity: 1;
    overflow-y: auto;
    visibility: visible;
    transform: translateX(0%);
    box-shadow: none;
  }
}

.switch {
  position: relative;
  display: block;
  cursor: pointer;
  user-select: none;
  margin-right: 0.5rem;
}
.switch-light, .switch-dark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform-origin: center;
  transform: translate(-50%, -50%);
  transition: all 0.3s ease-in;
}
.switch-light {
  font-size: 1.3rem;
  visibility: visible;
  color: var(--black-300);
}
.darkmode .switch-light {
  font-size: 0rem;
  visibility: hidden;
}
.switch-dark {
  font-size: 0rem;
  visibility: hidden;
  color: var(--white-100);
}
.darkmode .switch-dark {
  font-size: 1.3rem;
  visibility: visible;
}

.overlay {
  position: fixed;
  display: block;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9;
  opacity: 0;
  visibility: hidden;
  background-color: rgba(0, 0, 0, 0.7);
  transition: all 0.45s ease-in-out;
}
@media only screen and (max-width: 992px) {
  .overlay.is-active {
    opacity: 1;
    visibility: visible;
  }
}

.burger {
  position: relative;
  display: block;
  cursor: pointer;
  width: 1.6rem;
  height: 1rem;
  margin-right: 1rem;
  opacity: 0;
  visibility: hidden;
  background: transparent;
}
@media only screen and (max-width: 992px) {
  .burger {
    opacity: 1;
    visibility: visible;
  }
}
.burger-line {
  position: absolute;
  display: block;
  left: 0;
  width: 100%;
  height: 2px;
  opacity: 1;
  border-radius: 1rem;
  background: var(--black-400);
}
.darkmode .burger-line {
  background: var(--white-100);
}
.burger-line:nth-child(1) {
  top: 0px;
}
.burger-line:nth-child(2) {
  top: 0.5rem;
  width: 70%;
}
.burger-line:nth-child(3) {
  top: 1rem;
}
</style>
</head>
<body>
<!-- partial:index.partial.html -->
<header class="header" id="header">
   <nav class="navbar container">
      <section class="navbar-left">
         <a href="#" class="brand">Logo</a>
         <div class="burger" id="burger">
            <span class="burger-line"></span>
            <span class="burger-line"></span>
            <span class="burger-line"></span>
         </div>
      </section>
      <section class="navbar-center">
         <span class="overlay"></span>
         <div class="menu" id="menu">
            <div class="menu-header">
               <span class="menu-arrow"><i class="bx bx-chevron-left"></i></span>
               <span class="menu-title"></span>
            </div>
            <ul class="menu-inne.........完整代码请登录后点击上方下载按钮下载查看