我有两节课都是这样的。
class Stuff {
constructor() { }
things: Thing[] = [];
name: string;
}
class Thing {
constructor() { }
active: boolean;
}
我尝试在我的应用程序中声明一个字段,如下所示。
blopp: Stuff[] = [
{name: "aa", things: null},
{name: "bb", things: null}];
上面的方法效果很好。但是,当我尝试提供一个数组而不是 null 时,我收到错误,指出它不可分配给指定的类型。
blopp: Stuff[] = [
{name: "aa", things: [{active: true}, {active: false}]},
{name: "bb", things: null}];
您应该使用new
实例化对象的关键字:
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)
];
或者简单地使用接口:
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很重要,因为有些东西不适用于匿名对象:
/*
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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