---
createdAt: 2026-06-12
updatedAt: 2026-06-12
title: 变体
description: 在 Intlayer 内容文件中使用 variant 元数据字段来声明命名内容替代方案（A/B 测试、季节性横幅、受功能标志控制的文案），并在运行时切换它们而无需更改代码。
keywords:
  - 变体
  - A/B 测试
  - 功能标志
  - 动态内容
  - Intlayer
  - 国际化
slugs:
  - doc
  - concept
  - variants
history:
  - version: 9.0.0
    date: 2026-06-12
    changes: "发布变体字典功能"
author: aymericzip
---

# 变体

**变体**（Variant）是一组共享相同字典键（`key`）但声明不同变体名称（`variant`）的内容文件。Intlayer 会根据传递给 `useIntlayer` 的选择器提供合适的文件。

## 声明变体

每个文件代表一个命名替代方案。如果省略 `variant`（或将其设置为 `"default"`），则表示它是默认（回退）变体。

```ts fileName="hero-banner.content.ts" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
import { t, type Dictionary } from "intlayer";

const dictionary = {
  key: "hero-banner",
  variant: "default",
  content: {
    headline: t({
      en: "Build faster with Intlayer",
      fr: "Développez plus vite avec Intlayer",
    }),
    cta: t({ en: "Get started", fr: "Commencer" }),
  },
} satisfies Dictionary;

export default dictionary;
```

```ts fileName="hero-banner.black-friday.content.ts" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
import { t, type Dictionary } from "intlayer";

const dictionary = {
  key: "hero-banner",
  variant: "black_friday",
  content: {
    headline: t({
      en: "50 % off — today only",
      fr: "−50 % — aujourd'hui seulement",
    }),
    cta: t({ en: "Shop now", fr: "Acheter maintenant" }),
  },
} satisfies Dictionary;

export default dictionary;
```

## 使用变体

### 默认变体

<Tabs group="framework">
  <Tab label="React" value="react">
    ```tsx fileName="Hero.tsx" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
    import { useIntlayer } from "react-intlayer";

    export const Hero = () => {
      const { headline, cta } = useIntlayer("hero-banner");
      // → 默认变体

      return (
        <section>
          <h1>{headline}</h1>
          <a>{cta}</a>
        </section>
      );
    };
    ```

  </Tab>
  <Tab label="Next.js" value="nextjs">
    ```tsx fileName="Hero.tsx" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
    import { useIntlayer } from "next-intlayer";

    export const Hero = () => {
      const { headline, cta } = useIntlayer("hero-banner");
      // → 默认变体

      return (
        <section>
          <h1>{headline}</h1>
          <a>{cta}</a>
        </section>
      );
    };
    ```

  </Tab>
  <Tab label="Vue" value="vue">
    ```vue fileName="Hero.vue" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
    <script setup>
    import { useIntlayer } from "vue-intlayer";
    const { headline, cta } = useIntlayer("hero-banner");
    </script>

    <template>
      <section>
        <h1>{{ headline }}</h1>
        <a>{{ cta }}</a>
      </section>
    </template>
    ```

  </Tab>
  <Tab label="Svelte" value="svelte">
    ```svelte fileName="Hero.svelte" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
    <script lang="ts">
    import { useIntlayer } from "svelte-intlayer";
    const content = useIntlayer("hero-banner");
    </script>

    <section>
      <h1>{$content.headline}</h1>
      <a>{$content.cta}</a>
    </section>
    ```

  </Tab>
  <Tab label="Preact" value="preact">
    ```tsx fileName="Hero.tsx" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
    import { useIntlayer } from "preact-intlayer";

    export const Hero = () => {
      const { headline, cta } = useIntlayer("hero-banner");
      // → 默认变体

      return (
        <section>
          <h1>{headline}</h1>
          <a>{cta}</a>
        </section>
      );
    };
    ```

  </Tab>
  <Tab label="Solid" value="solid">
    ```tsx fileName="Hero.tsx" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
    import { useIntlayer } from "solid-intlayer";

    export const Hero = () => {
      const content = useIntlayer("hero-banner");
      // → 默认变体

      return (
        <section>
          <h1>{content().headline}</h1>
          <a>{content().cta}</a>
        </section>
      );
    };
    ```

  </Tab>
  <Tab label="Angular" value="angular">
    ```typescript fileName="hero.component.ts" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
    import { Component } from "@angular/core";
    import { useIntlayer } from "angular-intlayer";

    @Component({
      selector: "app-hero",
      template: `
        <section>
          <h1>{{ content().headline }}</h1>
          <a>{{ content().cta }}</a>
        </section>
      `,
    })
    export class HeroComponent {
      content = useIntlayer("hero-banner");
    }
    ```

  </Tab>
  <Tab label="Vanilla JS" value="vanilla">
    ```javascript fileName="hero.js"
    import { useIntlayer } from "vanilla-intlayer";

    const { headline, cta } = useIntlayer("hero-banner");

    document.body.innerHTML = `
      <section>
        <h1>${headline}</h1>
        <a>${cta}</a>
      </section>
    `;
    ```

  </Tab>
</Tabs>

### 命名变体

```tsx
const { headline, cta } = useIntlayer("hero-banner", {
  variant: "black_friday",
});
```

### 使用显式语言环境的命名变体

```tsx
const content = useIntlayer("hero-banner", {
  variant: "black_friday",
  locale: "zh",
});
```

## 典型使用场景

- 由实验键值驱动的文案 A/B 测试
- 季节性或促销横幅
- 受功能标志（feature flags）控制的消息文案
- 针对特定区域的营销活动