{"id":289,"date":"2026-10-19T10:22:26","date_gmt":"2026-10-19T02:22:26","guid":{"rendered":"https:\/\/yykcj.com\/?p=289"},"modified":"2026-10-19T10:22:26","modified_gmt":"2026-10-19T02:22:26","slug":"typescript-%e6%9d%a1%e4%bb%b6%e7%b1%bb%e5%9e%8b%e4%b8%8e%e6%98%a0%e5%b0%84%e7%b1%bb%e5%9e%8b%e5%ae%9e%e6%88%98%ef%bc%9a%e6%9e%84%e5%bb%ba%e7%b1%bb%e5%9e%8b%e5%ae%89%e5%85%a8%e7%9a%84%e5%b7%a5%e5%85%b7","status":"publish","type":"post","link":"https:\/\/yykcj.com\/?p=289","title":{"rendered":"TypeScript \u6761\u4ef6\u7c7b\u578b\u4e0e\u6620\u5c04\u7c7b\u578b\u5b9e\u6218\uff1a\u6784\u5efa\u7c7b\u578b\u5b89\u5168\u7684\u5de5\u5177\u5e93"},"content":{"rendered":"

\u4e3a\u4ec0\u4e48\u9700\u8981\u6761\u4ef6\u7c7b\u578b\u4e0e\u6620\u5c04\u7c7b\u578b\uff1f<\/h2>\n

\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u8fd9\u6837\u7684\u573a\u666f\uff1a\u9700\u8981\u6839\u636e\u4e00\u4e2a\u7c7b\u578b\u52a8\u6001\u751f\u6210\u53e6\u4e00\u4e2a\u7c7b\u578b\uff0c\u6216\u8005\u5bf9\u73b0\u6709\u7c7b\u578b\u7684\u5c5e\u6027\u8fdb\u884c\u6279\u91cf\u4fee\u6539\u3002\u6bd4\u5982\uff0c\u4ece\u4e00\u4e2a\u5927\u5bf9\u8c61\u7c7b\u578b\u4e2d\u63d0\u53d6\u51fa\u6240\u6709\u51fd\u6570\u7c7b\u578b\u7684\u5c5e\u6027\uff0c\u6216\u8005\u5c06\u67d0\u4e2a\u7c7b\u578b\u7684\u6240\u6709\u5c5e\u6027\u53d8\u4e3a\u53ea\u8bfb\u3002\u8fd9\u4e9b\u9700\u6c42\u5982\u679c\u624b\u52a8\u7f16\u5199\u7c7b\u578b\uff0c\u4e0d\u4ec5\u7e41\u7410\u800c\u4e14\u5bb9\u6613\u51fa\u9519\u3002TypeScript \u7684\u6761\u4ef6\u7c7b\u578b\uff08Conditional Types\uff09\u548c\u6620\u5c04\u7c7b\u578b\uff08Mapped Types\uff09\u6b63\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u7c7b\u95ee\u9898\u800c\u751f\u7684\u3002<\/p>\n

\u6761\u4ef6\u7c7b\u578b\u5141\u8bb8\u6211\u4eec\u6839\u636e\u7c7b\u578b\u5173\u7cfb\u8fdb\u884c\u5206\u652f\u5224\u65ad\uff0c\u7c7b\u4f3c\u4e8e JavaScript \u4e2d\u7684\u4e09\u5143\u8868\u8fbe\u5f0f\uff1b\u6620\u5c04\u7c7b\u578b\u5219\u5141\u8bb8\u6211\u4eec\u57fa\u4e8e\u65e7\u7c7b\u578b\u521b\u5efa\u65b0\u7c7b\u578b\uff0c\u901a\u8fc7\u904d\u5386\u5c5e\u6027\u952e\u6765\u751f\u6210\u65b0\u7684\u5c5e\u6027\u7c7b\u578b\u3002\u4e24\u8005\u7ed3\u5408\uff0c\u53ef\u4ee5\u6784\u5efa\u51fa\u975e\u5e38\u5f3a\u5927\u7684\u7c7b\u578b\u5de5\u5177\u3002<\/p>\n

\u672c\u6587\u5c06\u4ece\u57fa\u7840\u6982\u5ff5\u51fa\u53d1\uff0c\u901a\u8fc7\u5b9e\u73b0\u51e0\u4e2a\u5b9e\u7528\u7684\u5de5\u5177\u7c7b\u578b\uff0c\u5e26\u4f60\u6df1\u5165\u7406\u89e3\u6761\u4ef6\u7c7b\u578b\u4e0e\u6620\u5c04\u7c7b\u578b\u7684\u5e94\u7528\uff0c\u5e76\u5206\u4eab\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\u548c\u5e38\u89c1\u9677\u9631\u3002<\/p>\n

\u73af\u5883\u51c6\u5907<\/h2>\n

\u786e\u4fdd\u4f60\u7684 TypeScript \u7248\u672c\u5728 4.1 \u4ee5\u4e0a\uff08\u63a8\u8350 4.5+\uff09\uff0c\u56e0\u4e3a\u6211\u4eec\u4f1a\u7528\u5230\u6a21\u677f\u5b57\u9762\u91cf\u7c7b\u578b\u548c\u9012\u5f52\u6761\u4ef6\u7c7b\u578b\u3002\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u9879\u76ee\u76ee\u5f55\uff0c\u521d\u59cb\u5316 npm\uff0c\u5e76\u5b89\u88c5 TypeScript\uff1a<\/p>\n

\nmkdir ts-advanced-types\ncd ts-advanced-types\nnpm init -y\nnpm install typescript --save-dev\nnpx tsc --init\n<\/code><\/pre>\n
\u5728 tsconfig.json<\/code> \u4e2d\u542f\u7528\u4e25\u683c\u6a21\u5f0f\uff1a<\/p>\n
\n{\n  "compilerOptions": {\n    "strict": true,\n    "target": "ES2020",\n    "module": "CommonJS"\n  }\n}\n<\/code><\/pre>\n
1. \u6761\u4ef6\u7c7b\u578b\u57fa\u7840<\/h2>\n
\u6761\u4ef6\u7c7b\u578b\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
\ntype A = T extends U ? X : Y;\n<\/code><\/pre>\n
\u5982\u679c\u7c7b\u578b T<\/code> \u53ef\u4ee5\u8d4b\u503c\u7ed9\u7c7b\u578b U<\/code>\uff0c\u5219\u7ed3\u679c\u7c7b\u578b\u4e3a X<\/code>\uff0c\u5426\u5219\u4e3a Y<\/code>\u3002<\/p>\n
\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684 IsString<\/code> \u7c7b\u578b\uff1a<\/p>\n
\ntype IsString<T> = T extends string ? true : false;\n\ntype T1 = IsString<'hello'>; \/\/ true\ntype T2 = IsString<42>;      \/\/ false\n<\/code><\/pre>\n
\u6761\u4ef6\u7c7b\u578b\u8fd8\u652f\u6301\u5206\u5e03\u5f0f\u6761\u4ef6\u7c7b\u578b\uff1a\u5f53\u6761\u4ef6\u7c7b\u578b\u4f5c\u7528\u4e8e\u8054\u5408\u7c7b\u578b\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u5206\u53d1\u5230\u6bcf\u4e2a\u6210\u5458\u3002\u4f8b\u5982\uff1a<\/p>\n
\ntype ToArray<T> = T extends any ? T[] : never;\ntype T3 = ToArray<string | number>; \/\/ string[] | number[]\n<\/code><\/pre>\n
\u6ce8\u610f\uff0c\u5206\u5e03\u5f0f\u884c\u4e3a\u53ea\u5728\u6761\u4ef6\u7c7b\u578b\u76f4\u63a5\u4f5c\u7528\u4e8e\u88f8\u7c7b\u578b\u53c2\u6570\u65f6\u53d1\u751f\u3002\u5982\u679c\u88ab\u5305\u88f9\u5728\u5143\u7ec4\u6216\u5bf9\u8c61\u4e2d\uff0c\u5219\u4e0d\u4f1a\u5206\u53d1\u3002<\/p>\n
2. \u6620\u5c04\u7c7b\u578b\u57fa\u7840<\/h2>\n
\u6620\u5c04\u7c7b\u578b\u901a\u8fc7 in<\/code> \u5173\u952e\u5b57\u904d\u5386\u5c5e\u6027\u952e\u6765\u521b\u5efa\u65b0\u7c7b\u578b\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
\ntype Mapped<T> = {\n  [P in keyof T]: T[P];\n};\n<\/code><\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u4fee\u9970\u7b26\uff0c\u5982 readonly<\/code> \u6216 ?<\/code>\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7 +<\/code> \u548c -<\/code> \u6765\u6dfb\u52a0\u6216\u79fb\u9664\u4fee\u9970\u7b26\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5b9e\u73b0\u4e00\u4e2a MyPartial<\/code>\uff1a<\/p>\n
\ntype MyPartial<T> = {\n  [P in keyof T]?: T[P];\n};\n<\/code><\/pre>\n
3. \u5b9e\u6218\uff1a\u5b9e\u73b0 PickByValue<\/h2>\n
PickByValue<\/code> \u7528\u4e8e\u4ece\u5bf9\u8c61\u7c7b\u578b\u4e2d\u6311\u9009\u51fa\u503c\u7c7b\u578b\u7b26\u5408\u7279\u5b9a\u6761\u4ef6\u7684\u5c5e\u6027\u3002\u8fd9\u662f\u4e00\u4e2a\u7ed3\u5408\u6761\u4ef6\u7c7b\u578b\u548c\u6620\u5c04\u7c7b\u578b\u7684\u7ecf\u5178\u4f8b\u5b50\u3002<\/p>\n
\ntype PickByValue<T, ValueType> = Pick<\n  T,\n  { [Key in keyof T]-?: T[Key] extends ValueType ? Key : never }[keyof T]\n>;\n<\/code><\/pre>\n
\u89e3\u91ca\uff1a<\/p>\n
    \n
  • { [Key in keyof T]-?: T[Key] extends ValueType ? Key : never }<\/code> \u521b\u5efa\u4e00\u4e2a\u6620\u5c04\u7c7b\u578b\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u5c5e\u6027\uff0c\u5982\u679c\u5176\u503c\u7c7b\u578b\u53ef\u8d4b\u503c\u7ed9 ValueType<\/code>\uff0c\u5219\u4fdd\u7559\u952e\u540d\uff0c\u5426\u5219\u4e3a never<\/code>\u3002<\/li>\n
  • [keyof T]<\/code> \u7d22\u5f15\u8bbf\u95ee\u5f97\u5230\u6240\u6709\u952e\u7684\u8054\u5408\uff0c\u4f46\u5305\u542b never<\/code>\uff0c\u800c never<\/code> \u5728\u8054\u5408\u4e2d\u4f1a\u88ab\u5ffd\u7565\u3002<\/li>\n
  • \u6700\u540e\u7528 Pick<\/code> \u4ece T<\/code> \u4e2d\u6311\u9009\u51fa\u8fd9\u4e9b\u952e\u3002<\/li>\n<\/ul>\n
    \u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n
    \ninterface Person {\n  name: string;\n  age: number;\n  isActive: boolean;\n  greet: () => void;\n}\n\ntype StringKeys = PickByValue<Person, string>; \/\/ { name: string }\ntype FunctionKeys = PickByValue<Person, Function>; \/\/ { greet: () => void }\n<\/code><\/pre>\n
    \ud83d\udca1 \u6ce8\u610f\uff1a-?<\/code> \u4fee\u9970\u7b26\u7528\u4e8e\u79fb\u9664\u53ef\u9009\u6027\uff0c\u786e\u4fdd\u5728\u6761\u4ef6\u5224\u65ad\u4e2d\u4e0d\u4f1a\u56e0\u4e3a undefined<\/code> \u800c\u5e72\u6270\u3002<\/p>\n
    4. \u5b9e\u6218\uff1a\u5b9e\u73b0 DeepReadonly<\/h2>\n
    DeepReadonly<\/code> \u9012\u5f52\u5730\u5c06\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u53d8\u4e3a\u53ea\u8bfb\uff0c\u5305\u62ec\u5d4c\u5957\u5bf9\u8c61\u3002\u8fd9\u9700\u8981\u7ed3\u5408\u6620\u5c04\u7c7b\u578b\u548c\u6761\u4ef6\u7c7b\u578b\u3002<\/p>\n
    \ntype DeepReadonly<T> = {\n  readonly [P in keyof T]: T[P] extends object ? DeepReadonly<T[P]> : T[P];\n};\n<\/code><\/pre>\n
    \u4f46\u662f\uff0c\u8fd9\u4e2a\u7b80\u5355\u7248\u672c\u5bf9\u4e8e\u6570\u7ec4\u548c\u51fd\u6570\u4f1a\u6709\u95ee\u9898\uff1a\u51fd\u6570\u4e5f\u662f\u5bf9\u8c61\uff0c\u4f1a\u88ab\u9012\u5f52\u5904\u7406\uff0c\u5bfc\u81f4\u7c7b\u578b\u9519\u8bef\u3002\u6211\u4eec\u9700\u8981\u6392\u9664\u51fd\u6570\u548c\u6570\u7ec4\uff0c\u6216\u8005\u5bf9\u6570\u7ec4\u5355\u72ec\u5904\u7406\u3002<\/p>\n
    \u6539\u8fdb\u7248\uff1a<\/p>\n
    \ntype DeepReadonly<T> = T extends Function\n  ? T\n  : T extends Array<infer U>\n  ? ReadonlyArray<DeepReadonly<U>>\n  : T extends object\n  ? { readonly [P in keyof T]: DeepReadonly<T[P]> }\n  : T;\n<\/code><\/pre>\n
    \u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n
    \ninterface User {\n  name: string;\n  address: {\n    city: string;\n    zip: number;\n  };\n  hobbies: string[];\n}\n\ntype ReadonlyUser = DeepReadonly<User>;\n\/\/ \u7b49\u4ef7\u4e8e\uff1a\n\/\/ {\n\/\/   readonly name: string;\n\/\/   readonly address: {\n\/\/     readonly city: string;\n\/\/     readonly zip: number;\n\/\/   };\n\/\/   readonly hobbies: ReadonlyArray<string>;\n\/\/ }\n<\/code><\/pre>\n
    \ud83d\udca1 \u6ce8\u610f\uff1a\u9012\u5f52\u6761\u4ef6\u7c7b\u578b\u5728\u5904\u7406\u6df1\u5ea6\u5d4c\u5957\u6216\u5faa\u73af\u5f15\u7528\u65f6\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u6216\u65e0\u9650\u9012\u5f52\u3002\u5bf9\u4e8e\u5faa\u73af\u5f15\u7528\uff0cTypeScript \u4f1a\u62a5\u9519\u201cType instantiation is excessively deep\u201d\u3002\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u5e94\u907f\u514d\u8fc7\u5ea6\u9012\u5f52\uff0c\u6216\u4f7f\u7528\u63a5\u53e3\u6765\u6253\u7834\u5faa\u73af\u3002<\/p>\n
    5. \u5b9e\u6218\uff1a\u5b9e\u73b0 RequireAtLeastOne<\/h2>\n
    \u6709\u65f6\u6211\u4eec\u5e0c\u671b\u5bf9\u8c61\u81f3\u5c11\u6709\u4e00\u4e2a\u5c5e\u6027\u662f\u5fc5\u9700\u7684\uff0c\u5176\u4ed6\u5c5e\u6027\u53ef\u9009\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u6620\u5c04\u7c7b\u578b\u548c\u6761\u4ef6\u7c7b\u578b\u5b9e\u73b0\u3002<\/p>\n
    \ntype RequireAtLeastOne<T, Keys extends keyof T = keyof T> = Pick<\n  T,\n  Exclude<keyof T, Keys>\n> &\n  {\n    [K in Keys]-?: Required<Pick<T, K>> & Partial<Pick<T, Exclude<Keys, K>>>;\n  }[Keys];\n<\/code><\/pre>\n
    \u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n
    \ninterface Options {\n  a: string;\n  b: number;\n  c: boolean;\n}\n\ntype AtLeastOne = RequireAtLeastOne<Options>;\n\nconst obj1: AtLeastOne = { a: 'hello' }; \/\/ \u6b63\u786e\nconst obj2: AtLeastOne = { b: 42, c: true }; \/\/ \u6b63\u786e\nconst obj3: AtLeastOne = {}; \/\/ \u9519\u8bef\uff1a\u81f3\u5c11\u9700\u8981\u4e00\u4e2a\u5c5e\u6027\n<\/code><\/pre>\n
    6. \u5e38\u89c1\u9677\u9631\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h2>\n
      \n
    • \u5206\u5e03\u5f0f\u6761\u4ef6\u7c7b\u578b<\/strong>\uff1a\u5f53\u6761\u4ef6\u7c7b\u578b\u4f5c\u7528\u4e8e\u8054\u5408\u7c7b\u578b\u65f6\uff0c\u9ed8\u8ba4\u4f1a\u5206\u53d1\u3002\u5982\u679c\u4e0d\u5e0c\u671b\u5206\u53d1\uff0c\u53ef\u4ee5\u7528\u5143\u7ec4\u5305\u88f9\uff1a[T] extends [U] ? X : Y<\/code>\u3002<\/li>\n
    • never<\/code> \u7684\u5904\u7406<\/strong>\uff1a\u5728\u6620\u5c04\u7c7b\u578b\u4e2d\uff0cnever<\/code> \u4f5c\u4e3a\u952e\u4f1a\u88ab\u5ffd\u7565\uff0c\u8fd9\u5e38\u7528\u4e8e\u8fc7\u6ee4\u3002<\/li>\n
    • \u9012\u5f52\u6df1\u5ea6\u9650\u5236<\/strong>\uff1aTypeScript \u5bf9\u9012\u5f52\u7c7b\u578b\u6709\u6df1\u5ea6\u9650\u5236\uff08\u7ea6 50 \u5c42\uff09\uff0c\u5bf9\u4e8e\u6df1\u5c42\u5d4c\u5957\u7684\u6570\u636e\u7ed3\u6784\uff0c\u8003\u8651\u4f7f\u7528\u8fed\u4ee3\u65b9\u6cd5\u6216\u653e\u5bbd\u7c7b\u578b\u3002<\/li>\n
    • \u6027\u80fd\u4f18\u5316<\/strong>\uff1a\u590d\u6742\u7684\u6761\u4ef6\u7c7b\u578b\u548c\u6620\u5c04\u7c7b\u578b\u53ef\u80fd\u5f71\u54cd\u7f16\u8bd1\u901f\u5ea6\u3002\u5c3d\u91cf\u4f7f\u7528\u7c7b\u578b\u522b\u540d\u7f13\u5b58\u4e2d\u95f4\u7ed3\u679c\uff0c\u907f\u514d\u91cd\u590d\u8ba1\u7b97\u3002<\/li>\n
    • \u6d4b\u8bd5\u7c7b\u578b<\/strong>\uff1a\u53ef\u4ee5\u4f7f\u7528 \/\/ @ts-expect-error<\/code> \u6ce8\u91ca\u6765\u6d4b\u8bd5\u7c7b\u578b\u9519\u8bef\uff0c\u786e\u4fdd\u5de5\u5177\u7c7b\u578b\u6309\u9884\u671f\u5de5\u4f5c\u3002<\/li>\n<\/ul>\n
      \u603b\u7ed3<\/h2>\n
      \u6761\u4ef6\u7c7b\u578b\u548c\u6620\u5c04\u7c7b\u578b\u662f TypeScript \u7c7b\u578b\u7cfb\u7edf\u7684\u5f3a\u5927\u5de5\u5177\uff0c\u638c\u63e1\u5b83\u4eec\u53ef\u4ee5\u8ba9\u4f60\u7f16\u5199\u51fa\u66f4\u7075\u6d3b\u3001\u66f4\u5b89\u5168\u7684\u7c7b\u578b\u5b9a\u4e49\u3002\u672c\u6587\u901a\u8fc7\u5b9e\u73b0 PickByValue<\/code>\u3001DeepReadonly<\/code> \u548c RequireAtLeastOne<\/code> \u7b49\u5b9e\u7528\u5de5\u5177\u7c7b\u578b\uff0c\u5c55\u793a\u4e86\u5b83\u4eec\u7684\u5b9e\u9645\u5e94\u7528\u3002\u5efa\u8bae\u4f60\u5728\u9879\u76ee\u4e2d\u5c1d\u8bd5\u5c01\u88c5\u81ea\u5df1\u7684\u5de5\u5177\u7c7b\u578b\uff0c\u5e76\u7f16\u5199\u7c7b\u578b\u6d4b\u8bd5\u6765\u4fdd\u8bc1\u6b63\u786e\u6027\u3002<\/p>\n
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