Mixin

JS 不支持多继承，但可以通过 Mixin 模拟。

export function mix<T extends new (...args: any[]) => unknown>(ctor: T, ...bases: any[]) {
  bases.forEach((baseCtor) => {
    Object.getOwnPropertyNames(baseCtor.prototype).forEach((name) => {
      Object.defineProperty(
        ctor.prototype,
        name,
        Object.getOwnPropertyDescriptor(baseCtor.prototype, name) || Object.create(null)
      )
    })
  })
  return ctor
}

class A {
  a() {console.log('a')}
}
class B {
  b() {console.log('b')}
}
class C {}

mix(C, A, B)

interface C extends A, B {}

const c = new C()
c.a() // a
c.b() // b

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最后更新于2个月前