Deprecated and obsolete features

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제외 예정 기능
Obsolete features

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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.

RegExp 속성

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

Property	Description
`$1-$9`	Parenthesized substring matches, if any. Warning: Using these properties can result in problems, since browser extensions can modify them. Avoid them!
`$_`	See `input`.
`$*`	See `multiline`.
`$&`	See `lastMatch`.
`$+`	See `lastParen`.
$`	See `leftContext`.
`$'`	See `rightContext`.
`input`	The string against which a regular expression is matched.
`lastMatch`	The last matched characters.
`lastParen`	The last parenthesized substring match, if any.
`leftContext`	The substring preceding the most recent match.
`rightContext`	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`	The index at which to start the next match.
`multiline`	Whether or not to search in strings across multiple lines.
`source`	패턴의 텍스트.

RegExp 메서드

compile() 메서드는 제외될 예정입니다.
valueOf 메서드는 더 이상 RegExp 전용이 아닙니다. Object.valueOf()를 사용하세요.

Function 속성

The caller 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.

Legacy generator

Legacy generator function statement and Legacy generator function expression are deprecated. Use function* statement and function* expression instead.
JS1.7/JS1.8 Array comprehension and JS1.7/JS1.8 Generator comprehension are deprecated.

Iterator

StopIteration is deprecated.
Iterator is deprecated.

Object methods

watch and unwatch are deprecated. Use Proxy instead.
__iterator__ is deprecated.
__noSuchMethod__ is deprecated. Use Proxy instead.

Date methods

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

Functions

Expression closures are deprecated. Use regular functions or arrow functions instead.

Proxy

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

Escape sequences

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

String methods

HTML wrapper methods like String.prototype.fontsize and String.prototype.big.
String.prototype.quote is removed from Firefox 37.
non standard flags parameter in String.prototype.search, String.prototype.match, and String.prototype.replace are deprecated.

Obsolete features

These obsolete features have been entirely removed from JavaScript and can no longer be used as of the indicated version of JavaScript.

Object

Property	Description
`__count__`	Returns the number of enumerable properties directly on a user-defined object.
`__parent__`	Points to an object's context.
`Object.prototype.eval()`	Evaluates a string of JavaScript code in the context of the specified object.
`Object.observe()`	Asynchronously observing the changes to an object.
`Object.unobserve()`	Remove observers.
`Object.getNotifier()`	Creates an object that allows to synthetically trigger a change.

Function

Property	Description
`arity`	Number of formal arguments.

Array

Property	Description
`Array.observe()`	Asynchronously observing changes to Arrays.
`Array.unobserve()`	Remove observers.

Number

Number.toInteger()

ParallelArray

ParallelArray

Statements

for each...in is deprecated. Use for...of instead.
Destructuring for...in is deprecated. Use for...of instead.
let blocks and let expressions are obsolete.

E4X

See E4X for more information.

Sharp variables

See Sharp variables in JavaScript for more information.

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이 페이지의 공헌자: urty5656, imskojs

최종 변경자: urty5656, 2018. 9. 14. 오전 1:49:58