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[英]How to call a method from another method within the same object in JavaScript?
[英]Javascript - How to call a method in another method within the same class
如何在javascript中的同一類中的另一個方法中調用方法。 我試過調用它
this.save(books);
像這樣。 但我收到一個錯誤:
未捕獲的類型錯誤:this.save 不是函數
有什么建議
class Book {
constructor(title, author, isbn) {
this.title = title;
this.author = author;
this.isbn = isbn;
}
static getBooks() {
const books = localStorage.getItem('books');
return books === null ? [] : JSON.parse(books);
}
static displayBooks() {
const books = Book.getBooks();
books.forEach((book) => {
const ui = new UI();
ui.addBookToList(book);
});
}
static addBook(book) {
console.log(this);
const books = Book.getBooks();
books.push(book);
this.save(books);
}
static removeBook(isbn) {
const books = Book.getBooks(),
bookIndex = books.findIndex((book) => book.isbn === isbn);
books.splice(bookIndex, 1);
this.save(books);
}
save(books) {
localStorage.setItem('books', JSON.stringify(books));
}
}
靜態方法是在類本身上調用的,而不是類的實例,要么使save
方法為靜態,要么使caller
方法為非靜態。
參考: https : //developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/static
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