Deprecated and obsolete features

본 페이지는 자바스크립트의 제외 예정인(즉, 아직 사용할 수 있지만 제거 계획이 있는) 기능과 제외된(즉, 더 이상 사용할 수 없는) 기능을 나열합니다.

제외 예정 기능

아래 기능은 아직 사용할 수 있지만, 언젠가 제거될 예정이므로 주의를 기울여야 합니다. 작성한 코드가 항목 중 하나를 포함하고 있다면 제거해야 합니다.

아래 속성은 제외 예정입니다. 이는 String.replace 사용에 영향을 주지 않습니다.

Property	Description
`$1-$9`	Parenthesized substring matches, if any. Warning: Using these properties can result in problems, since browser extensions can modify them. Avoid them!
`$_` (en-US)	See `input`.
`$*`	See `multiline`.
`$&` (en-US)	See `lastMatch`.
`$+` (en-US)	See `lastParen`.
$` (en-US)	See `leftContext`.
`$'` (en-US)	See `rightContext`.
`input` (en-US)	The string against which a regular expression is matched.
`lastMatch` (en-US)	The last matched characters.
`lastParen` (en-US)	The last parenthesized substring match, if any.
`leftContext` (en-US)	The substring preceding the most recent match.
`rightContext` (en-US)	The substring following the most recent match.

The following are now properties of RegExp instances, no longer of the RegExp object:

Property	Description
`global`	Whether or not to test the regular expression against all possible matches in a string, or only against the first.
`ignoreCase`	Whether or not to ignore case while attempting a match in a string.
`lastIndex` (en-US)	The index at which to start the next match.
`multiline`	Whether or not to search in strings across multiple lines.
`source` (en-US)	패턴의 텍스트.

The caller (en-US) and arguments properties are deprecated, because they leak the function caller. Instead of the arguments property, you should use the arguments object inside function closures.

getYear (en-US) and setYear (en-US) are affected by the Year-2000-Problem and have been subsumed by getFullYear and setFullYear.
You should use toISOString instead of the deprecated toGMTString (en-US) method in new code.
toLocaleFormat is deprecated.

Proxy.create and Proxy.createFunction are deprecated. Use Proxy instead.
The following traps are obsolete:
- hasOwn (Firefox bug 980565, Firefox 33).
- getEnumerablePropertyKeys (Firefox bug 783829, Firefox 37)
- getOwnPropertyNames (Firefox bug 1007334, Firefox 33)
- keys (Firefox bug 1007334, Firefox 33)

Octal escape sequences (\ followed by one, two, or three octal digits) are deprecated in string and regular expression literals.
The escape (en-US) and unescape (en-US) functions are deprecated. Use encodeURI, encodeURIComponent, decodeURI or decodeURIComponent to encode and decode escape sequences for special characters.