TS使用注意点（持续更新）

1. 派生类的构造器中必须调用super
2. 类的参数属性，简写写法参数属性，parameter properties

// 类的参数属性
class Account{
    readonly id:number;
    owner:string;
    private _balance:number;
    nickname?:string;
    
    constructor(id:number,owner:string,balance:number){
        this.id = id;
        this.owner = owner;
        this._balance = balance;
        
    }
    
}

将上述类的参数简写

class Account {
    nickname?:string;
    
    constructor(
        public readonly id：number,
        public owner: string,
        private _balance: number
    ){}
}