[英]Converting Javascript member variable to Typescript member variable
I am trying to work out how to convert the member variables of my Javascript code to the Typescript equivalent. 我正在尝试找出如何将Javascript代码的成员变量转换为Typescript等效项。
In my Javascript code, after the constructor()
I have: 在我的Javascript代码中,在
constructor()
之后,我有:
this.theMediaItem = [];
this.theMediaItem.embedLink = '';
this.theMediaItem.username = '';
I have tried the following as the Typescript equivalent, inserted as required between the export class
and the constructor()
but it doesn't like the '.': 我已经尝试了以下内容作为Typescript等效项,并根据需要将其插入了
export class
和constructor()
但它不喜欢'。':
theMediaItem = [];
theMediaItem.embedLink = '';
theMediaItem.username = '';
For what you are describing, here's one typescript equivalent: 对于您要描述的内容,这里有一个等效的打字稿:
interface MediaItemArray<T> extends Array<T> {
embedLink?: string;
username?: string;
}
class MyClass {
theMediaItem: MediaItemArray<any> = [];
constructor() {
this.theMediaItem.embedLink = "";
this.theMediaItem.username = "";
}
}
That's kind of strange though... you probably don't want to use an array and it's best to just have properties directly on the class: 但是,这有点奇怪……您可能不想使用数组,最好直接在类上具有属性:
class MediaItem {
embedLink = "";
username = "";
}
Or described in an interface: 或在界面中描述:
interface MediaItem {
embedLink: string;
username: string;
}
Then, as you say in the comments, if you have a view you can add it as a property like so: 然后,如您在评论中所述,如果您有视图,则可以将其添加为属性,如下所示:
class MyView {
mediaItem = new MediaItem()
}
Or if you are using an interface: 或者,如果您使用的是界面:
class MyView {
mediaItem: MediaItem = {
embedLink: "",
username: ""
};
}
You need to use syntax below, also make sure you don't define your theMediaItem
as array, because from usage I see that you assign its properties: 您需要使用以下语法,还请确保不要将
theMediaItem
定义为数组,因为从使用情况看,您将为其分配属性:
class YourClass {
constructor() {
this.theMediaItem = {};
this.theMediaItem.embedLink = '';
this.theMediaItem.username = '';
}
}
or do it in simple way: 或以简单的方式做到这一点:
class YourClass {
theMediaItem = { embedLink: '', username: '' },
constructor() {
// ...
}
}
https://www.typescriptlang.org/docs/tutorial.html https://www.typescriptlang.org/docs/tutorial.html
Did you try the 'dictionary' pattern? 您尝试过“词典”模式吗? Please refer the TS document and wiki page below.
请参考下面的TS文档和Wiki页面。
interface Dictionary { [index: string]: string; 接口Dictionary {[index:string]:string; }
}
https://typescript.codeplex.com/wikipage?title=Interfaces%20in%20TypeScript&referringTitle=TypeScript%20Documentation https://typescript.codeplex.com/wikipage?title=接口%20in%20TypeScript&referringTitle = TypeScript%20Documentation
https://en.wikipedia.org/wiki/Associative_array#Example https://zh.wikipedia.org/wiki/Associative_array#Example
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