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对象作为javaScript中的模型[关闭]

javascript

Alexander Tarasenko · 技术社区 · 6 年前

假设我有图书馆课和图书课。例如,我有一些书,它们都存放在这个图书馆里。我的问题如下: 我应该使用Library类作为模型来保存我的图书对象吗? 这样地:

class Library {
    static addBook(book){
        this.books.push(book);
    }

    static getBooksList() {
        return this.books;
    }
}

还是先创建库的抽象类,然后创建对象并将此对象用作存储(model)更好

1 回复 | 直到 6 年前

trincot Jakube 6 年前

最灵活的方法是不要假设只有一个库,即使在您当前的需求中可能是这样。

所以我不会在库类中使用静态方法,而是使用库实例

class Library {
    constructor(name) {
        this.name = name;
        this.books = []; // Instantiate the books array.
    }
    addBook(book) {
        this.books.push(book);
        // Some extra handling if a book can only be in one library
        if (book.library) book.library.removeBook(book);
        book.library = this; 
    }
    removeBook(book) {
        let i = this.books.indexOf(book);
        if (i === -1) return;
        this.books.splice(i, 1);
        book.library = null;
    }
    getBooksList() {
        return this.books;
    }
}

class Book {
     constructor(title, author) {
         this.title = title;
         this.author = author;
         this.library = null;
     }
}

const book = new Book("1984", "George Orwell");
const library = new Library("The London Library");
library.addBook(book);
console.log("The book " + book.title + " is in " + book.library.name);

const otherLibrary = new Library("The Library of Birmingam");
otherLibrary.addBook(book);
console.log("The book " + book.title + " is in " + book.library.name);