Javascript 你能在 TypeScript 中创建嵌套类吗？
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Can you create nested classes in TypeScript?
提问by basarat
Is there a way to nest classes in TypeScript. E.g. I'd like to use them like:
有没有办法在 TypeScript 中嵌套类。例如，我想像这样使用它们：
var foo = new Foo();
var bar = new Foo.Bar();
回答by basarat
回答by bnieland
Here is a more complex use case using class expressions.
这是一个使用类表达式的更复杂的用例。
It allows the inner classto access the privatemembers of the outer class.
它允许内部类访问外部类的private成员。
class classX {
private y: number = 0;
public getY(): number { return this.y; }
public utilities = new class {
constructor(public superThis: classX) {
}
public testSetOuterPrivate(target: number) {
this.superThis.y = target;
}
}(this);
}
const x1: classX = new classX();
alert(x1.getY());
x1.utilities.testSetOuterPrivate(4);
alert(x1.getY());
回答by Dan Def
I couldn't get this to work with exported classes without receiving a compile error, instead I used namespaces:
我无法在没有收到编译错误的情况下使用导出的类，而是使用了命名空间：
namespace MyNamespace {
export class Foo { }
}
namespace MyNamespace.Foo {
export class Bar { }
}
回答by danvk
If you're in the context of a type declaration file, you can do this by mixing classes and namespaces:
如果您在类型声明文件的上下文中，则可以通过混合类和命名空间来实现：
// foo.d.ts
declare class Foo {
constructor();
fooMethod(): any;
}
declare namespace Foo {
class Bar {
constructor();
barMethod(): any;
}
}
// ...elsewhere
const foo = new Foo();
const bar = new Foo.Bar();
回答by Aydus-Matthew
This approach worked in a typescript Angular2/Ionic2 environment.
这种方法适用于打字稿 Angular2/Ionic2 环境。
foo.ts
脚
import { Bar} from './bar';
export class Foo {
id: number;
bar: Bar;
}
bar.ts
bar.ts
export class Bar {
id: number;
}
Example class usage:
示例类用法：
foo = new Foo();
foo.bar = new Bar();
foo.bar.id = 1;
