Deprecated and obsolete features

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This page lists features of JavaScript that are deprecated (that is, still available but planned for removal) and obsolete (that is, no longer usable).

Deprecated features

These deprecated features can still be used, but should be used with caution because they are expected to be removed entirely sometime in the future. You should work to remove their use from your code.

RegExp properties

The following properties are deprecated. This does not affect their use in replacement strings:

Свойство Описание
$1-$9

Parenthesized substring matches, if any.
Warning: Using these properties can result in problems, since browser extensions can modify them. Avoid them!

$_ Смотрите input.
$*  Смотрите multiline.
$& Смотрите lastMatch.
$+ Смотрите lastParen.
$` Смотрите leftContext.
$' Смотрите 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:

Свойство Описание
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 The text of the pattern.

RegExp methods

Function properties

  • 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

Iterator

Object methods

Методы даты

Functions

Proxy

Escape sequences

Методы строк

Obsolete features

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

Объект

Свойство Описание
__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

Свойство Описание
arity Number of formal arguments.

Массив

Свойство Описание
Array.observe() Асинхронный просмотр изменений в массивах. 
Array.unobserve() Remove observers.

Число

ParallelArray

Statements

E4X

Смотрите E4X.

Sharp variables

Смотрите Sharp variables in JavaScript.