TypeScript-部分 <T> 不能按預期工作？

Question

以下引發：

Type '{ wheels: 4; }' is not assignable to type 'Partial<T>'.

這是代碼：

interface Vehicle{
    wheels: number;
}

class Driver<T extends Vehicle>{
    car: Partial<T>;
    constructor(){
        this.car = {wheels: 4} 
        // Type '{ wheels: 4; }' is not assignable to type 'Partial<T>'.
        // (property) Driver<T extends Vehicle>.car: Partial<T>
    }
}

有任何想法嗎？

Answer 1

如果有幫助，請嘗試以下操作：

interface Vehicle {
    wheels: number
}
type DumpDriver = Partial<Vehicle>;
class Driver<T extends Vehicle> {
    car: DumpDriver;
    constructor(){
        this.car = { wheels: 4 };
    }
}
var doubleCross = new Driver();
console.log(doubleCross.car);

class WhichDriver<T extends Vehicle> {
    wheels: number;
    constructor(){
        this.wheels = 4;
    }
}
var whereIsTheBaggage = new WhichDriver();
console.log(whereIsTheBaggage.wheels);