September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
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216
｜
第
8
章
8.5
让类中的方法支持串联
8.5.1
问题
你想让类中定义的方法可以串联起来，在一个语句中连续调用。
8.5.2
方案
在支持方法串联的各个方法最后返回当前对象。在自定义的类中，通常只需添加
return this
语句。
下面举个例子。这个自定义的
Book
类有两个方法，
raisePrice()
和
releaseNewEdition()
，它们都支持方法串联。
class
Book {
constructor(title, author, price, publishedDate) {
this
.title = title;
this
.author = author;
this
.price = price;
this
.publishedDate = publishedDate;
}
raisePrice(percent) {
const
increase =
this
.price*percent;
this
.price += Math.round(increase)/100;
return this
;
}
releaseNewEdition() {
//
把
pulishedDate
设为今天
this
.publishedDate =
new
Date();
return this
;
}
}
const
book =
new
Book('I Love Mathematics', 'Adam Up', 15.99,
new
Date(2010, 2, 2));
// ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.