本文最后更新于 2024年4月4日 下午
领英课程： JavaScript Code Challenges 系列：EP1- Available Books
描述
题目只作简要描述，具体题目请点击上方👆🏻标题跳转。
参数
title, author, ISBN, numCopies
方法
getAvailability()：根据书本的库存返回对应提示
sell(numSold)：售出指定数量书本，若无传递参数，则为默认为1
restock(numCopies)：入库数量，若无传递参数，则为默认为5
清单
- 使用类
- 使用 getter 方法
代码实现
Class
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
| class Book {
constructor(title, author, ISBN, numCopies) {
this.title = title;
this.author = author;
this.ISBN = ISBN;
this.numCopies = numCopies;
}
get availability() {
return this.getAvailability();
}
getAvailability() {
if (this.numCopies <= 0) {
return 'Out of stock';
} else if (this.numCopies < 10) {
return `Low stock: ${this.numCopies}`;
}
return `In stock: ${this.numCopies}`;
}
sell(numSold = 1) {
if (this.numCopies <= 0) {
console.log('No stock');
return;
}
this.numCopies -= numSold;
}
restock(numCopiesStocked = 5) {
this.numCopies += numCopiesStocked;
}
}
|
ES5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
| function Book(title, author, ISBN, numCopies) {
this.title = title;
this.author = author;
this.ISBN = ISBN;
this.numCopies = numCopies;
}
Book.prototype.sell = function(numSold = 1) {
...
}
Book.prototype.restock = function(numCopiesStocked = 5) {
...
}
Book.prototype.getAvailability = function() {
...
}
|