17 lines
341 B
TypeScript
17 lines
341 B
TypeScript
// keyof 操作符，遍历对象的key
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export type keys<T> = keyof T;
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const a = { a: 1, b: 2, c: 3 };
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// typeof 提取类型
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export type Ta = keys<typeof a>;
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// Omit 去除某一项
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export type Ta2 = Omit<typeof a, "b">;
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// Pick 选择某一项
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export type Ta3 = Pick<typeof a, "c">;
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// & 添加
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export type Ta4 = Ta3 & { d: string };
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