{"componentChunkName":"component---src-templates-tag-js","path":"/tag/book/","result":{"data":{"contentfulTag":{"title":"book","id":"20f7775d-e1bb-5ea2-897b-9e6b6f42304f","slug":"book","post":[{"id":"89e6cf85-7fac-5234-91c3-2b6e4269547d","title":"인사이드 자바스크립트 책 읽으며","slug":"inside-javascript","publishDate":"March 13, 2019","publishDateISO":"2019-03-13","heroImage":{"title":"Inside JavaScript","fluid":{"aspectRatio":1.5059171597633136,"src":"//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=1800&q=50","srcSet":"//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=450&h=299&q=50 450w,\n//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=900&h=598&q=50 900w,\n//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=1018&h=676&q=50 1018w","srcWebp":"//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=1800&q=50&fm=webp","srcSetWebp":"//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=450&h=299&q=50&fm=webp 450w,\n//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=900&h=598&q=50&fm=webp 900w,\n//images.ctfassets.net/e1rkozd9gki4/2mtaZ1t56mLxR6UjGZZsea/4392de668e4f07b576e13317718197ef/Screen_Shot_2019-03-15_at_12.22.37_AM.png?w=1018&h=676&q=50&fm=webp 1018w","sizes":"(max-width: 1800px) 100vw, 1800px"}},"body":{"childMarkdownRemark":{"timeToRead":2,"html":"

자바스크립의 핵심 개념

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1. 객체

\n\n

1-1) 숫자

\n\n
var num = 5 /2;\nconsole.log(num); // (출력값) 2.5\nconsole.log(Math.floor(num)); // (출력값) 2
\n

1-2) 문자열

\n\n
// str 문자열 생성\nvar str = 'test';\nconsole.log(str[0], str[1], str[2], str[3]); // (출력값) test\nstr[0] = 'T'; // 문자열의 첫 글자를 대문자로 변경?\nconsole.log(str); // (출력값) test
\n

1-3) 불린값

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1-4) null과 undefined

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// null 타입 변수 생성\nvar nullVar = null;\nconsole.log(typeof nullVar === null); // (출력값) false\nconsole.log(nullVar === null); // (출력값) true
\n

2. 함수

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3. 프로토타입

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4. 실행 컨텍스트와 클로저

\n","excerpt":"자바스크립의 핵심 개념 1. 객체 자바스크립의 기본 데이터 타입\" boolean, number, string. 특별한 값: null…"}}}]}},"pageContext":{"slug":"book","limit":6,"skip":0,"numPages":1,"currentPage":1}}}