{
  "url": "https://unifast.dev/vi/docs/packages/core/extract-text/",
  "locale": "vi",
  "title": "extractText()",
  "description": "Trích xuất đệ quy toàn bộ nội dung văn bản từ một nút HAST.",
  "section": "packages",
  "body": "```ts\nimport { extractText } from \"@unifast/core\";\n```\n\n## Chữ ký\n\n```ts\nfunction extractText(node: HastNode): string\n```\n\n## Tham số\n\n### node\n\n| Thuộc tính | Kiểu | Mặc định | Mô tả |\n|----------|------|---------|-------------|\n| `type` | `string` | — | Loại nút (`\"root\"`, `\"element\"`, `\"text\"`, v.v.) |\n| `children` | `HastNode[]` | — | Các nút con (dành cho loại `\"root\"` và `\"element\"`) |\n| `value` | `string` | — | Nội dung văn bản (dành cho loại `\"text\"`) |\n\n## Giá trị trả về\n\n`string` — Toàn bộ nội dung văn bản được nối lại từ nút hiện tại và các nút con cháu của nó.\n\n## Cách dùng\n\n```ts\nimport { extractText } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst element: HastElement = {\n  type: \"element\",\n  tagName: \"p\",\n  properties: {},\n  children: [\n    { type: \"text\", value: \"Hello \" },\n    {\n      type: \"element\",\n      tagName: \"strong\",\n      properties: {},\n      children: [{ type: \"text\", value: \"world\" }],\n    },\n  ],\n};\n\nconst text = extractText(element);\n\nconsole.log(text);\n// Hello world\n```\n\n## Ví dụ\n\n### Trích xuất từ một phần tử đơn giản\n\n```ts\nimport { extractText } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst heading: HastElement = {\n  type: \"element\",\n  tagName: \"h1\",\n  properties: { id: \"title\" },\n  children: [{ type: \"text\", value: \"Getting Started\" }],\n};\n\nconsole.log(extractText(heading));\n// Getting Started\n```\n\n### Trích xuất từ các phần tử lồng nhau\n\n```ts\nimport { extractText } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst paragraph: HastElement = {\n  type: \"element\",\n  tagName: \"p\",\n  properties: {},\n  children: [\n    { type: \"text\", value: \"This is \" },\n    {\n      type: \"element\",\n      tagName: \"em\",\n      properties: {},\n      children: [\n        { type: \"text\", value: \"deeply \" },\n        {\n          type: \"element\",\n          tagName: \"strong\",\n          properties: {},\n          children: [{ type: \"text\", value: \"nested\" }],\n        },\n      ],\n    },\n    { type: \"text\", value: \" content.\" },\n  ],\n};\n\nconsole.log(extractText(paragraph));\n// This is deeply nested content.\n```\n\n### Phần tử rỗng\n\n```ts\nimport { extractText } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst emptyDiv: HastElement = {\n  type: \"element\",\n  tagName: \"div\",\n  properties: {},\n  children: [],\n};\n\nconsole.log(extractText(emptyDiv));\n// (empty string)\n```\n\n### Sinh slug cho tiêu đề\n\n```ts\nimport { extractText } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst heading: HastElement = {\n  type: \"element\",\n  tagName: \"h2\",\n  properties: {},\n  children: [\n    { type: \"text\", value: \"API \" },\n    {\n      type: \"element\",\n      tagName: \"code\",\n      properties: {},\n      children: [{ type: \"text\", value: \"Reference\" }],\n    },\n  ],\n};\n\nconst slug = extractText(heading).toLowerCase().replace(/\\s+/g, \"-\");\n\nconsole.log(slug);\n// api-reference\n```",
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