• TS 中的接口和 JS 中的类一样是可以继承的

interface LengthInterface {
    length: number
}

interface WidthInterface {
    width: number
}

interface HeightInterface {
    height: number
}

interface RectInterface extends LengthInterface, WidthInterface, HeightInterface {
    color: string
}

let rect: RectInterface = {
    length: 10,
    width: 20,
    height: 30,
    color: 'red'
}

console.log(rect);