如何在 Typescript 中将对象分配给数组答案

【问题标题】：How to assign object to array in Typescript如何在 Typescript 中将对象分配给数组
【发布时间】：2019-09-04 22:43:43
【问题描述】：

我在 Typescript 中有一个类，我在 this 中分配时遇到问题。类的一部分。我收到以下错误。 “ListingHistory”类型缺少“ListingHistory[]”类型的以下属性：length、pop、push、concat 和 26 个以上。ts(2740)

下面是我的本节课

export class History {
    public address: string;
    public listingHistory: ListingHistory[];
    public saleHistory: SaleHistory[] ;
    public mortgageHistory: MortgageHistory[];

    constructor(address: string, listingHistory?: ListingHistory, saleHistory ?: SaleHistory ,
                mortgageHistory?: MortgageHistory) {

       this.address = address;
       this.listingHistory = listingHistory;
       this.saleHistory(push)saleHistory;
       this.mortgageHistory = mortgageHistory;

}

【问题讨论】：

标签： typescript

【解决方案1】：

您创建了一个ListingHistory 数组，但将一个ListingHistory 项传递给您的构造函数

export class History {
public address: string;
public listingHistory: ListingHistory[];
public saleHistory: SaleHistory[] ;
public mortgageHistory: MortgageHistory[];

constructor(public address: string, public listingHistory?: ListingHistory[], public saleHistory ?: SaleHistory[],
            public mortgageHistory?: MortgageHistory[]) {

   this.address = address;
   this.listingHistory = listingHistory;
   this.saleHistory(push)saleHistory;
   this.mortgageHistory = mortgageHistory;

 }

【讨论】：

@MisterniceGuy 我刚刚编辑了它，希望它现在可以正常工作
你在初始化History类的listingHistory属性时传递了什么？从错误来看，您似乎没有传递类似数组的对象....您可能传递的是 ListingHistory 而不是 ListingHistory[] 的数组？

【解决方案2】：

你将一个可以为空的listingHistory 传递给构造函数您可能需要初始化 ListingHistory 字段

export class History {
public address: string;
public listingHistory: ListingHistory[];
public saleHistory: SaleHistory[];
public mortgageHistory: MortgageHistory[];

constructor(address: string, listingHistory?: ListingHistory, saleHistory ?: SaleHistory ,
            mortgageHistory?: MortgageHistory[]) {

   this.address = address;
   this.listingHistory = listingHistory || [];
   this.saleHistory = saleHistory || [];
   this.mortgageHistory = mortgageHistory || [];

}

【讨论】：