如何在TypeScript中使用嵌套对象数组声明一个对象? [英] How to declare an object with nested array of objects in TypeScript?
本文介绍了如何在TypeScript中使用嵌套对象数组声明一个对象?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有两个这样的班级.
class Stuff {
constructor() { }
things: Thing[] = [];
name: string;
}
class Thing {
constructor() { }
active: boolean;
}
我试图像这样在我的应用程序中声明一个字段.
I tried to declare a field in my application like this.
blopp: Stuff[] = [
{name: "aa", things: null},
{name: "bb", things: null}];
以上方法效果很好.但是,当我尝试提供事物的数组而不是null时,我得到的错误是它不能以指定的类型分配.
The above approach works just fine. However, when I try to provide an array of things, instead of null, I get the error that it's not assignable the the type specified.
blopp: Stuff[] = [
{name: "aa", things: [{active: true}, {active: false}]},
{name: "bb", things: null}];
推荐答案
您应该使用 new
关键字实例化对象:
You should be using the new
keyword to instantiate your objects:
class Stuff {
constructor(public name: string, public things: Thing[] = []) { }
}
class Thing {
constructor(public active: boolean) {
};
}
var blopp: Stuff[] = [
new Stuff("aa", [new Thing(true), new Thing(false)]),
new Stuff("bb", null)
];
或仅使用接口:
interface IThing {
active: boolean
}
interface IStuff {
name: string;
things: IThing[]
}
var blopp: IStuff[] = [
{ name: "aa", things: [{ active: true }, { active: false }] },
{ name: "bb", things: null }];
确定是否需要类或接口非常重要,因为某些事情不适用于匿名对象:
It is important to determine if you need classes or interface as some things will not work with anonymous objects:
/*
class Stuff {
constructor(public name: string, public things: Thing[] = []) { }
}
class Thing {
constructor(public active: boolean) {
};
}
var blopp: Stuff[] = [
{ name: "aa", things: [{ active: true }, { active: false }] },
new Stuff("bb", null)
];
console.log("Is blopp[0] Stuff:", blopp[0] instanceof Stuff);
console.log("Is blopp[1] Stuff:", blopp[1] instanceof Stuff);
*/
var Stuff = (function () {
function Stuff(name, things) {
if (things === void 0) { things = []; }
this.name = name;
this.things = things;
}
return Stuff;
}());
var Thing = (function () {
function Thing(active) {
this.active = active;
}
;
return Thing;
}());
var blopp = [
{ name: "aa", things: [{ active: true }, { active: false }] },
new Stuff("bb", null)
];
console.log("Is blopp[0] Stuff:", blopp[0] instanceof Stuff);
console.log("Is blopp[1] Stuff:", blopp[1] instanceof Stuff);
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