Question

假设我有一个Article模型，该模型具有一个字段，其中字段的名称用不同的语言表示：

class Article {
  constructor(public name: Translation[]) { }
}

class Translation {
  constructor(
    public language: string,
    public text: string
  ) { }
}

我希望能够调用一种方法，以将该文章名称转换为作为参数提供的语言：

article.name.translate('EN')

如何将这种方法添加到翻译的数组中？

Answer 1

V1：

public static void main(String args[]) {
    String stringToEncrypt = "plain_text";
    String publicKey = "<public_key>";
    System.out.println(encrypt(stringToEncrypt, publicKey))
}

public String encrypt(String plain, String publicKey) {
    try {
        byte[] keyBytes = Base64.decode(publicKey, Base64.DEFAULT);
        X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
        PublicKey rsaPublicKey = KeyFactory.getInstance("RSA").generatePublic(spec);
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, rsaPublicKey);
        byte[] plainTextBytes = plain.getBytes(Charset.forName("US-ASCII"));
        byte[] encryptedBytes = cipher.doFinal(plainTextBytes);
        return Base64.encodeToString(encryptedBytes, Base64.NO_WRAP));
    } catch (Exception e) {
        e.printStackTrace();
    }
    return "";
}

V2：

class Article {
    constructor(public name: Translation[]) { }

    public translate(language:string):string {
        return this.name.find(t=>t.language==language).text;
    }
}


class Translation {
    constructor(
        public language: string,
        public text: string
    ) { }
}

let a = new Article([
    new Translation('EN', 'Yes'),
    new Translation('DE', 'Ja')
]);
a.translate('EN');

Answer 2

在运行时只有一个Array类，因此为一种类型的数组添加方法将为所有类型的数组添加方法，这可能导致冲突。话虽如此，您只能为一种Typescript数组类型添加方法，例如

class Article {
    constructor(public name: Translation[]) { }
}

class Translation {
    constructor(
        public language: string,
        public text: string
    ) { }
}

interface Array<T> { // this has to be in global of în a module
    translate(this: Translation[], lang: string): string;
}

Array.prototype.translate = function (lang) {
    var t = this.find(o => o.language == lang);
    return t && t.text;

}

let article = new Article([

]);
article.name.translate('EN')

打字稿：将方法添加到类的数组

2 个答案: