tailwindcss

Tailwind CSS v4 开发指南

有效使用 Tailwind CSS v4 工具类的最佳实践。

注意：Tailwind CSS v4 于 2025 年 1 月发布，采用 CSS 优先的配置方式。如需兼容 v3，仍可使用 tailwind.config.js。

核心原则

1. 工具类优先：使用工具类，而不是自定义 CSS
2. 移动优先：先为移动设备设计，再使用响应式修饰符扩展
3. 提取组件：将重复的模式提取为组件
4. 间距一致：使用 Tailwind 的间距刻度
5. 自定义配置：扩展默认主题，保持品牌一致性

基础工具类

布局

// Flexbox
<div className="flex items-center justify-between gap-4">
  <div className="flex-1">Content</div>
  <div className="flex-shrink-0">Sidebar</div>
</div>

// Grid
<div className="grid grid-cols-3 gap-4">
  <div>1</div>
  <div>2</div>
  <div>3</div>
</div>

// Positioning
<div className="relative">
  <div className="absolute top-0 right-0">Badge</div>
</div>

间距

// Padding and Margin
<div className="p-4 m-2">           {/* padding: 1rem, margin: 0.5rem */}
<div className="px-6 py-4">        {/* padding-x: 1.5rem, padding-y: 1rem */}
<div className="mt-8 mb-4">        {/* margin-top: 2rem, margin-bottom: 1rem */}

// Space between children
<div className="space-y-4">        {/* margin-bottom on all but last child */}
  <div>Item 1</div>
  <div>Item 2</div>
</div>

排版

<h1 className="text-4xl font-bold text-gray-900">Heading</h1>
<p className="text-base font-normal text-gray-600 leading-relaxed">
  Paragraph text with comfortable line height.
</p>
<span className="text-sm font-medium text-blue-600">Label</span>

颜色

// Text colors
<p className="text-gray-900 dark:text-gray-100">Text</p>

// Background colors
<div className="bg-blue-500 hover:bg-blue-600">Button</div>

// Border colors
<div className="border border-gray-300">Box</div>

响应式设计

断点

// Mobile-first responsive classes
<div className="w-full md:w-1/2 lg:w-1/3">
  {/* Full width on mobile, half on medium screens, third on large */}
</div>

<h1 className="text-2xl md:text-4xl lg:text-6xl">
  {/* Responsive text sizes */}
</h1>

<div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
  {/* Responsive grid */}
</div>

容器

<div className="container mx-auto px-4">
  {/* Centered container with horizontal padding */}
</div>

<div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
  {/* Responsive container padding */}
</div>

组件模式

按钮

<button className="px-4 py-2 bg-blue-600 text-white font-medium rounded-md hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 disabled:opacity-50 disabled:cursor-not-allowed transition-colors">
  Click me
</button>

// Variants
<button className="px-4 py-2 border border-gray-300 rounded-md hover:bg-gray-50">
  Secondary
</button>

卡片

<div className="overflow-hidden rounded-lg bg-white shadow-md">
    <img src="/image.jpg" alt="" className="h-48 w-full object-cover" />
    <div className="p-6">
        <h2 className="mb-2 text-xl font-semibold">Card Title</h2>
        <p className="text-gray-600">Card content goes here.</p>
    </div>
</div>

表单输入框

<div className="space-y-2">
    <label htmlFor="email" className="block text-sm font-medium text-gray-700">
        Email
    </label>
    <input
        type="email"
        id="email"
        className="w-full rounded-md border border-gray-300 px-3 py-2 focus:border-transparent focus:ring-2 focus:ring-blue-500 focus:outline-none"
        placeholder="[email protected]"
    />
    <p className="text-sm text-gray-500">We'll never share your email.</p>
</div>

状态变体

悬停、焦点、激活

<button className="bg-blue-500 hover:bg-blue-600 active:bg-blue-700 focus:ring-2 focus:ring-blue-500">
  Interactive Button
</button>

<a href="#" className="text-blue-600 hover:text-blue-800 hover:underline">
  Link
</a>

组悬停

<div className="group">
    <img src="/image.jpg" className="transition-opacity group-hover:opacity-75" />
    <p className="group-hover:text-blue-600">Hover the container</p>
</div>

禁用

<button className="disabled:cursor-not-allowed disabled:opacity-50" disabled>
    Disabled Button
</button>

深色模式

/* Tailwind v4: Configure in app/globals.css */
@import "tailwindcss";

@media (prefers-color-scheme: dark) {
    /* Or use class-based: .dark */
}

// Usage (same as v3)
<div className="bg-white text-gray-900 dark:bg-gray-900 dark:text-gray-100">
    <h1 className="text-gray-900 dark:text-white">Title</h1>
    <p className="text-gray-600 dark:text-gray-400">Description</p>
</div>

自定义样式

任意值

<div className="top-[117px]">           {/* Custom top value */}
<div className="bg-[#1da1f2]">          {/* Custom color */}
<div className="grid-cols-[200px_1fr]"> {/* Custom grid template */}

@apply 指令

/* components/button.css */
.btn-primary {
    @apply rounded-md bg-blue-600 px-4 py-2 font-medium text-white;
    @apply hover:bg-blue-700 focus:ring-2 focus:ring-blue-500 focus:outline-none;
    @apply disabled:cursor-not-allowed disabled:opacity-50;
}

配置

Tailwind v4：CSS 优先配置

/* app/globals.css */
@import "tailwindcss";

@theme {
    /* Custom colors */
    --color-brand-50: #eff6ff;
    --color-brand-100: #dbeafe;
    --color-brand-900: #1e3a8a;

    /* Custom spacing */
    --spacing-128: 32rem;

    /* Custom fonts */
    --font-family-sans: "Inter", sans-serif;

    /* Custom breakpoints */
    --breakpoint-3xl: 1920px;
}

Tailwind v3 配置（仍受支持）

// tailwind.config.js (optional in v4)
module.exports = {
    content: ["./app/**/*.{js,ts,jsx,tsx,mdx}", "./components/**/*.{js,ts,jsx,tsx,mdx}"],
    theme: {
        extend: {
            colors: {
                brand: {
                    50: "#eff6ff",
                    100: "#dbeafe",
                    900: "#1e3a8a"
                }
            },
            spacing: {
                128: "32rem"
            },
            fontFamily: {
                sans: ["Inter", "sans-serif"]
            }
        }
    },
    plugins: [require("@tailwindcss/forms"), require("@tailwindcss/typography")]
}

插件

官方插件

npm install @tailwindcss/forms
npm install @tailwindcss/typography
npm install @tailwindcss/aspect-ratio
npm install @tailwindcss/container-queries

// @tailwindcss/forms
<input type="text" className="form-input rounded-md" />

// @tailwindcss/typography
<article className="prose lg:prose-xl">
  <h1>Article Title</h1>
  <p>Content...</p>
</article>

性能

自动检测内容

Tailwind v4 会自动检测并扫描所有模板文件，无需配置 content。

构建性能

与 v3 相比，Tailwind v4 借助 @property 和 color-mix() 等现代 CSS 功能，完整构建速度提升至 3.5 倍（约 100ms）。

浏览器要求：Safari 16.4+、Chrome 111+、Firefox 128+

常见模式

居中内容

<div className="flex min-h-screen items-center justify-center">
    <div>Centered content</div>
</div>

粘性页眉

<header className="sticky top-0 z-50 border-b bg-white">
    <nav>Navigation</nav>
</header>

网格布局

<div className="grid grid-cols-1 gap-6 md:grid-cols-2 lg:grid-cols-3">
    {posts.map((post) => (
        <PostCard key={post.id} post={post} />
    ))}
</div>

文本截断

<p className="truncate">This text will be truncated with ellipsis if too long</p>
<p className="line-clamp-3">This text will show max 3 lines with ellipsis</p>

最佳实践

1. 保持间距一致：遵循 Tailwind 的间距刻度
2. 默认采用响应式设计：始终考虑移动优先设计
3. 提取组件：避免重复冗长的类名列表
4. 使用主题颜色：在配置中定义自定义颜色，而不是使用任意值
5. 谨慎使用 @apply：在 JSX 中优先使用工具类
6. 启用深色模式：从一开始就规划深色模式
7. 使用插件：利用官方插件满足常见需求
8. 优化生产环境：确保正确配置 purge