October 2024
Beginner to intermediate
452 pages
9h 28m
Korean
Content preview from 실전 코드로 배우는 Vue.js
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122
실전 코드로 배우는 Vue.js
NOTE
와처에서 실행되거나
computed
프로퍼티 내부에서 실행되는 부가 로직은 언제든지 부작용을 낳
을 위험이 있다. 이들이 컴포넌트 성능에 영향을 미치지 않도록 주의해서 다루어야 한다.
지금까지의 예시처럼 와처의 핸들러 함수는 와처의 이름에 직접 할당할 수 있다. 이때
Vue
엔진은 와처에 기본 설정을 적용한 뒤 알아서 핸들러를 호출한다. 한편 와처의 작동 방식을
직접 설정하고 이를 객체에 담아 와처 이름에 전달하는 방법도 있다. [표
3
-
2
]는 와처 설정
객체의 필드들이다.
표
3-2
와처 객체 필드 와처 객체 필드
필드 설명 타입 기본값 필수
handler
대상 데이터값이 변경될 때 실행되는 콜백 함수
function N
/
A
예
deep
대상 데이터의 하위 프로퍼티(존재할 경우) 변화
관찰 여부
boolean
false
아니오
immediate
컴포넌트 마운트 이후 핸들러 즉시 실행 여부
boolean
false
아니오
flush
핸들러의 실행 시점. 기본설정의 경우
Vue
는
컴포넌트 업데이트 전에 핸들러를 실행한다.
pre
,
post
pre
아니오
3.6.1
하위 프로퍼티 변화 관찰
deep
옵션 필드를 설정하면 모든 하위 프로퍼티의 변화를 관찰할 수 있다. 예를 들어
User-
WatcherComponent
컴포넌트에
user
객체
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.