打字稿空对象和任何区别 [英] Typescript empty object and any difference

问题描述

谁能解释一下 {} 和 any 之间的区别是什么?

Could somebody explain me which is the difference between {} and any?

例如，这是将通用接口参数设置为 Interface<{}> 或设置为 Interface 之间的区别.

for example, which's the difference between setting generic interface parameter as Interface<{}> or as Interface<any>.

有什么想法吗?

推荐答案

要更好地理解 {} 的含义，请查看 https://blog.mariusschulz.com/2017/02/24/typescript-2-2-the-object-输入

to better understand what does {} mean, check https://blog.mariusschulz.com/2017/02/24/typescript-2-2-the-object-type

{} 是顶级类型.这是什么意思 ?如果您将某些内容注释为 {}，它可以是以下任何类型:string |数量 |布尔值 |对象 |{[key:string]: 任意} |对象 |任何[]

{} is a top type. What does it mean ? if you annotate something as {} it can be any of following types: string | number | boolean | object | {[key:string]: any} | Object | any[]

const test1: {} = 'hello'
const test2: {} = 123
const test3: {} = false
const test4: {} = {foo:'bar'}

虽然 null |未定义是不允许的

// Expect errors
const test6: {} = null
const test7: {} = undefined

游乐场链接

any 完全关闭类型检查器，你可以做任何疯狂"的事情，你已经习惯了香草 JS.专业提示:不要在家里使用它 :) 一定要在 ts-lint

any completely turns off type checker and you can do anything "crazy", that you've been used to from vanilla JS. PRO TIP: don't use this at home :) definitely use no-any rule within ts-lint

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