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  "url": "https://unifast.dev/zh-TW/docs/packages/node/img-lazy-loading/",
  "locale": "zh-TW",
  "title": "imgLazyLoading()",
  "description": "為圖片加上 loading=\"lazy\" 屬性以實現延遲載入。",
  "section": "packages",
  "body": "```ts\nimport { imgLazyLoading } from \"@unifast/node\";\n```\n\n## 函式簽名\n\n```ts\nfunction imgLazyLoading(options?: ImgLazyLoadingPluginOptions): UnifastPlugin\n```\n\n## 參數\n\n### options?\n\n延遲載入行為的設定\n\n| 屬性 | 型別 | 預設值 | 說明 |\n|----------|------|---------|-------------|\n| `skipFirst` | `number` | `0` | 要跳過的圖片數量（例如跳過 hero 圖片） |\n\n此外掛會對符合條件的 `<img>` 元素同時加上 `loading=\"lazy\"` 與 `decoding=\"async\"` 屬性，包含巢狀於其他元素內部的圖片。\n\n## 用法\n\n```ts\nimport { compile, imgLazyLoading } from \"@unifast/node\";\n\nconst md = `\n![Photo 1](photo1.jpg)\n\n![Photo 2](photo2.jpg)\n\n![Photo 3](photo3.jpg)\n`;\n\nconst result = compile(md, {\n  plugins: [imgLazyLoading()],\n});\n\n// All images get loading=\"lazy\" and decoding=\"async\":\n// <img src=\"photo1.jpg\" alt=\"Photo 1\" loading=\"lazy\" decoding=\"async\">\n// <img src=\"photo2.jpg\" alt=\"Photo 2\" loading=\"lazy\" decoding=\"async\">\n// <img src=\"photo3.jpg\" alt=\"Photo 3\" loading=\"lazy\" decoding=\"async\">\n```\n\n## 範例\n\n### 跳過第一張圖片（hero 圖片模式）\n\n頁面上的第一張圖片通常是 hero 或橫幅圖片，應該立刻載入。使用 `skipFirst` 可將其排除於延遲載入之外：\n\n```ts\nimport { compile, imgLazyLoading } from \"@unifast/node\";\n\nconst md = `\n![Hero banner](hero.jpg)\n\nSome introductory content...\n\n![Diagram](diagram.jpg)\n\nMore content...\n\n![Screenshot](screenshot.jpg)\n`;\n\nconst result = compile(md, {\n  plugins: [\n    imgLazyLoading({\n      skipFirst: 1,\n    }),\n  ],\n});\n\n// First image loads eagerly (no loading attribute):\n// <img src=\"hero.jpg\" alt=\"Hero banner\">\n//\n// Remaining images are lazy loaded:\n// <img src=\"diagram.jpg\" alt=\"Diagram\" loading=\"lazy\" decoding=\"async\">\n// <img src=\"screenshot.jpg\" alt=\"Screenshot\" loading=\"lazy\" decoding=\"async\">\n```\n\n### 跳過多張首屏圖片\n\n```ts\nimport { compile, imgLazyLoading } from \"@unifast/node\";\n\nconst result = compile(md, {\n  plugins: [\n    imgLazyLoading({\n      skipFirst: 3, // skip the first 3 images\n    }),\n  ],\n});\n```",
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