Javascript 使用 TypeScript super()
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Using TypeScript super()
提问by alex bennett
I am trying to extend a class in TypeScript. I keep receiving this error on compile: 'Supplied parameters do not match any signature of call target.' I have tried referencing the artist.name property in the super call as super(name) but is not working.
我正在尝试在 TypeScript 中扩展一个类。我在编译时不断收到此错误：“提供的参数与调用目标的任何签名都不匹配。” 我曾尝试将 super 调用中的 Artist.name 属性引用为 super(name) 但不起作用。
Any ideas and explanations you may have will be greatly appreciated. Thanks - Alex.
您的任何想法和解释将不胜感激。谢谢 - 亚历克斯。
class Artist {
constructor(
public name: string,
public age: number,
public style: string,
public location: string
){
console.log(`instantiated ${name}, whom is ${age} old, from ${location}, and heavily regarded in the ${style} community`);
}
}
class StreetArtist extends Artist {
constructor(
public medium: string,
public famous: boolean,
public arrested: boolean,
public art: Artist
){
super();
console.log(`instantiated ${this.name}. Are they famous? ${famous}. Are they locked up? ${arrested}`);
}
}
interface Human {
name: string,
age: number
}
function getArtist(artist: Human){
console.log(artist.name)
}
let Banksy = new Artist(
"Banksy",
40,
"Politcal Graffitti",
"England / Wolrd"
)
getArtist(Banksy);
回答by mollwe
The super call must supply all parameters for base class. The constructor is not inherited. Commented out artist because I guess it is not needed when doing like this.
super 调用必须为基类提供所有参数。构造函数不是继承的。注释掉艺术家，因为我想这样做时不需要它。
class StreetArtist extends Artist {
constructor(
name: string,
age: number,
style: string,
location: string,
public medium: string,
public famous: boolean,
public arrested: boolean,
/*public art: Artist*/
){
super(name, age, style, location);
console.log(`instantiated ${this.name}. Are they famous? ${famous}. Are they locked up? ${arrested}`);
}
}
Or if you intended the art parameter to populate base properties, but in that case I guess there isn't really a need for using public on art parameter as the properties would be inherited and it would only store duplicate data.
或者，如果您打算使用 art 参数来填充基本属性，但在这种情况下，我想实际上并不需要在 art 参数上使用 public，因为这些属性将被继承，并且它只会存储重复数据。
class StreetArtist extends Artist {
constructor(
public medium: string,
public famous: boolean,
public arrested: boolean,
/*public */art: Artist
){
super(art.name, art.age, art.style, art.location);
console.log(`instantiated ${this.name}. Are they famous? ${famous}. Are they locked up? ${arrested}`);
}
}
