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 featuresThese 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 propertiesThe following properties are deprecated. This does not affect their use in replacement strings:
СвойÑÑво ÐпиÑание$1-$9 Parenthesized substring matches, if any. Warning: Using these properties can result in problems, since browser extensions can modify them. Avoid them! $_ СмоÑÑиÑе input. $* СмоÑÑиÑе multiline. $& СмоÑÑиÑе lastMatch. $+ СмоÑÑиÑе lastParen. $` СмоÑÑиÑе leftContext. $' СмоÑÑиÑе 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:
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
compile() method is deprecated.valueOf method is no longer specialized for RegExp. Use Object.valueOf().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.StopIteration ÑÑÑаÑел.Iterator ÑÑÑаÑел.watch and unwatch are deprecated. Use Proxy instead.__iterator__ ÑÑÑаÑел.Object.prototype.__noSuchMethod__ is deprecated. Use Proxy instead.getYear и setYear are affected by the Year-2000-Problem and have been subsumed by getFullYear и setFullYear.toISOString instead of the deprecated toGMTString method in new code.toLocaleFormat is deprecated.Proxy instead.hasOwn (Firefox bug 980565, Firefox 33).getEnumerablePropertyKeys (Firefox bug 783829, Firefox 37)getOwnPropertyNames (Firefox bug 1007334, Firefox 33)keys (Firefox bug 1007334, Firefox 33)escape and unescape functions are deprecated. Use encodeURI, encodeURIComponent, decodeURI or decodeURIComponent to encode and decode escape sequences for special characters.String.prototype.fontsize and String.prototype.big.String.prototype.quote is removed from Firefox 37.flags parameter in String.prototype.search, String.prototype.match, and String.prototype.replace are deprecated.String.prototype.substr probably won't be removed anytime soon, but it's defined in Annex B of the ECMA-262 standard, whose introduction states: "⦠Programmers should not use or assume the existence of these features and behaviours when writing new ECMAScript code. â¦"These obsolete features have been entirely removed from JavaScript and can no longer be used as of the indicated version of JavaScript.
ÐбÑÐµÐºÑ Function СвойÑÑво ÐпиÑаниеarity Number of formal arguments. ÐаÑÑив СвойÑÑво ÐпиÑание Array.observe() ÐÑинÑ
ÑоннÑй пÑоÑмоÑÑ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ð¹ в маÑÑиваÑ
. Array.unobserve() Remove observers. ЧиÑло ParallelArray Statements
for each...in is deprecated. Use for...of instead.for...in is deprecated. Use for...of instead.СмоÑÑиÑе E4X.
Sharp variablesСмоÑÑиÑе Sharp variables in JavaScript.
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