typescript 界面内的打字稿默认功能
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typescript default function inside interface
提问by Angel Angel
This is working
这是工作
interface test{
imp():number;
}
but it is possible to implement a function inside.
但可以在内部实现一个功能。
interface test{
imp():number{
// do something if it is not overwritten
}
}
This is not working in typescript for me, but there may be some reserved word, for example default or similar, to implement a function inside an interface that is not overwritten if the default work.
这对我来说在打字稿中不起作用，但可能有一些保留字，例如 default 或类似的，以在默认工作时不会覆盖的接口内实现函数。
采纳答案by basarat
No. TypeScript Interfaces are not something available at runtime, that is they are completely absent in the generated JavaScript.
不可以。TypeScript 接口在运行时不可用，也就是说它们在生成的 JavaScript 中完全不存在。
Perhaps you meant to use class:
也许您打算使用class：
class Test{
imp(){return 123}
}
回答by realh
I've discovered that Typescript seems to allow an interface and another class or object to share the same name. So you can do this:
我发现 Typescript 似乎允许接口和另一个类或对象共享相同的名称。所以你可以这样做：
interface test {
imp(): number
}
class test {
static imp() { return 123 }
}
class test2 /* extends something */ implements test {
imp() { return test.imp() }
}
It's a pity TS doesn't support function implementations in interfaces, like Kotlin does, to save us writing the wrapper methods, because it could be implemented quite easily in the underlying Javascript.
遗憾的是 TS 不支持接口中的函数实现，就像 Kotlin 那样，以节省我们编写包装器方法，因为它可以很容易地在底层 Javascript 中实现。
