Webkeyof keyof 可以用来取得一个对象接口的所有 key 值： interface Person { name: string; age: number; location?: string; } type K1 = keyof Person; // "name" "age" "location" … Webconst keys = Object.keys(new IMyTable()); — 德里克 source 6 也许为时已晚，但是在2.1版打字稿中，您可以这样使用 key of ： interface Person { name: string; age: number; …

TS进阶之keyof - 简书

WebExample Get your own TypeScript Server. interface Person {. name: string; age: number; } // `keyof Person` here creates a union type of "name" and "age", other strings will not … Using the keyof operator on the type Person will give you a new type as shown in the following code: type SomeNewType = keyof Person This SomeNewType is a union of literal types ( "name" "age" "location") that is made from the properties of type Person. Now you can create objects of type SomeNewType: Meer weergeven Literal types in TypeScript are more specific types of string, number or boolean. For example, "Hello World" is a string, but a string is not "Hello World". "Hello World" … Meer weergeven As you might already know, the typeof operator gives you the type of an object.In the above example of Person interface, we already knew the type, so we just had to use the keyof … Meer weergeven keyof of some type T gives you a new type that is a union of literal types and these literal types are the names of the properties of T. The resulting type is a subtype of string. For example, consider the following … Meer weergeven In TypeScript, enums are used as types at compile-time to achieve type-safety for the constants but they are treated as objects at runtime. This is because, they are converted to plain objects once the TypeScript … Meer weergeven oswald history

ts中，keyof用法 - SegmentFault 思否

Web15 mei 2024 · 一、类型别名 TypeScript 提供了为类型注解设置别名的便捷语法，你可以使用 type SomeName = someValidTypeAnnotation 来创建别名，比如 http://www.semlinker.com/ts-keyof/ WebGitHub Gist: instantly share code, notes, and snippets. rock climbing crete