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第一次接触浏览器的LocalStorage

news 2026/5/11 23:13:44

欢迎来到本系列的第7篇。在之前的文章中，我们主要关注组件的内部逻辑。今天，我们将把视野扩大到整个网站的架构。

深色模式（Dark Mode）不仅仅是一个“开关”，它涉及到 CSS 架构设计的核心思想——变量化。同时，为了让网站“记住”用户的选择，我们将第一次接触浏览器的LocalStorage（本地存储）。

本篇我们将实现：

基于 CSS 变量 的主题系统。

一个平滑切换的“日/夜”开关。

使用 JS 读取和保存用户偏好。

第一部分：HTML 结构搭建 (语义化与开关)

HTML 结构相对简单。我们主要需要两部分：

页面内容：用于展示主题切换后的效果（如标题、卡片、文字）。

切换开关：一个用于触发切换的按钮。

<body>

<!-- 1. 顶部导航栏 -->
<nav class="navbar">
<div class="logo">MyBrand</div>

<!--
主题切换开关
aria-label 是为了无障碍访问
-->
<button id="theme-toggle" class="theme-btn" aria-label="切换主题">
<!-- 默认显示月亮图标 (代表点击进入深色模式) -->
<span class="icon">🌙</span>
<span class="text">深色模式</span>
</button>
</nav>

<!-- 2. 主要内容区域 -->
<main class="container">

<div class="hero-section">
<h1>欢迎来到我的博客</h1>
<p>这是一个演示 CSS 变量和深色模式切换的页面。</p>
</div>

<div class="card-grid">
<!-- 卡片 1 -->
<div class="card">
<h2>文章标题 1</h2>
<p>这是一些示例文本。在深色模式下，背景变黑，文字变白。</p>
<a href="#" class="link">阅读更多</a>
</div>

<!-- 卡片 2 -->
<div class="card">
<h2>文章标题 2</h2>
<p>CSS 变量让这一切变得非常简单且高效。</p>
<a href="#" class="link">阅读更多</a>
</div>
</div>

</main>

</body>


第二部分：CSS 样式 (CSS 变量的魔力)

这是本篇的核心。我们不再直接写死颜色（如 #ffffff 或 #000000），而是定义变量。

逻辑如下：

在 :root (默认状态) 下定义一套“浅色”变量。

在 [data-theme="dark"] 状态下重新定义这套变量为“深色”值。

在具体的 CSS 规则中，只使用 var(--variable-name)。

/* --- 1. 定义变量系统 --- */

/* 默认 (浅色) 主题 */
:root {
/* 背景色 */
--bg-body: #f4f7f6;
--bg-card: #ffffff;
--bg-nav: #ffffff;

/* 文本色 */
--text-primary: #333333;
--text-secondary: #666666;

/* 强调色 */
--accent-color: #007bff;

/* 边框与阴影 */
--border-color: #e1e4e8;
--shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* 深色主题 (通过 data-theme="dark" 属性激活) */
[data-theme="dark"] {
--bg-body: #1a1a1a;
--bg-card: #2d2d2d;
--bg-nav: #2d2d2d;

--text-primary: #ffffff;
--text-secondary: #b0b0b0;

--accent-color: #4dabf7; /* 深色模式下通常颜色要稍微亮一点 */

--border-color: #444444;
--shadow: 0 4px 12px rgba(0,0,0,0.3);
}

/* --- 2. 应用变量 --- */

body {
background-color: var(--bg-body);
color: var(--text-primary);
font-family: -apple-system, sans-serif;
/* 核心：添加 transition 让颜色切换平滑过渡 */
transition: background-color 0.3s ease, color 0.3s ease;
margin: 0;
}

.navbar {
background-color: var(--bg-nav);
border-bottom: 1px solid var(--border-color);
padding: 15px 30px;
display: flex;
justify-content: space-between;
align-items: center;
transition: background-color 0.3s ease, border-color 0.3s ease;
}

.card {
background-color: var(--bg-card);
border: 1px solid var(--border-color);
box-shadow: var(--shadow);
padding: 25px;
border-radius: 8px;
transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.card h2 { margin-top: 0; }

.card p { color: var(--text-secondary); }

.link { color: var(--accent-color); text-decoration: none; }


/* --- 开关按钮样式 --- */
.theme-btn {
background: transparent;
border: 1px solid var(--border-color);
color: var(--text-primary);
padding: 8px 16px;
border-radius: 20px;
cursor: pointer;
display: flex;
align-items: center;
gap: 8px;
transition: all 0.3s ease;
}

.theme-btn:hover {
background-color: var(--bg-body);
}

/* 布局辅助 */
.container { max-width: 800px; margin: 40px auto; padding: 0 20px; }
.card-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }


第三部分：JS 交互逻辑 (LocalStorage)

JavaScript 的任务不仅仅是切换类名，更重要的是持久化用户的选择。

逻辑流程：

初始化：页面加载时，检查 localStorage。如果有保存的设置，立即应用。

切换：点击按钮时，切换 html 标签上的 data-theme 属性。

保存：将当前的状态（'dark' 或 'light'）写入 localStorage。

document.addEventListener('DOMContentLoaded', () => {

// 1. 获取 DOM 元素
const toggleBtn = document.getElementById('theme-toggle');
const toggleIcon = toggleBtn.querySelector('.icon');
const toggleText = toggleBtn.querySelector('.text');

// 我们将把 data-theme 属性放在 <html> 标签上
const htmlElement = document.documentElement;

// --- 辅助函数：更新按钮 UI ---
const updateButtonUI = (isDark) => {
if (isDark) {
toggleIcon.textContent = '☀';
toggleText.textContent = '浅色模式';
} else {
toggleIcon.textContent = '🌙';
toggleText.textContent = '深色模式';
}
};

// --- 2. 初始化：检查本地存储 ---
// 检查用户之前是否选过
const savedTheme = localStorage.getItem('myAppTheme');

// 如果之前保存了 'dark'，则立即应用
if (savedTheme === 'dark') {
htmlElement.setAttribute('data-theme', 'dark');
updateButtonUI(true);
} else {
// 默认是浅色，无需操作 (或者也可以显式设置 'light')
updateButtonUI(false);
}

// --- 3. 绑定点击事件 ---
toggleBtn.addEventListener('click', () => {

// 检查当前是否是深色模式
const currentTheme = htmlElement.getAttribute('data-theme');

if (currentTheme === 'dark') {
// -> 切换为浅色
htmlElement.setAttribute('data-theme', 'light');
localStorage.setItem('myAppTheme', 'light'); // 保存到本地
updateButtonUI(false);
} else {
// -> 切换为深色
htmlElement.setAttribute('data-theme', 'dark');
localStorage.setItem('myAppTheme', 'dark'); // 保存到本地
updateButtonUI(true);
}

});

});


总结

恭喜！您构建了一个现代化的、具备记忆功能的深色模式系统。

我们学到了：

CSS 变量 (:root)：这是现代 CSS 最强大的功能之一，它彻底改变了我们管理颜色的方式。

属性选择器 ([data-theme="..."])：利用 HTML 属性来驱动 CSS 样式的变化。

LocalStorage：如何使用简单的 setItem 和 getItem 让网页拥有“记忆”，极大地提升了用户体验。

这套逻辑是通用的，您可以将其应用到任何规模的 Web 项目中。

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