Object.prototype.unwatch()

You’re reading the English version of this content since no translation exists yet for this locale. Help us translate this article!

Deprecation warning: Do not use unwatch() and watch()! These two methods were implemented only in Firefox prior to version 58, they're deprecated and removed in Firefox 58+. In addition, using watchpoints has a serious negative impact on performance, which is especially true when used on global objects, such as window. You can usually use setters and getters or proxies instead.

The unwatch() method removes a watchpoint set with the watch() method.

Syntax

obj.unwatch(prop)

Parameters

prop
The name of a property of the object to stop watching.

Return value

undefined.

Description

The JavaScript debugger has functionality similar to that provided by this method, as well as other debugging options. For information on the debugger, see Venkman.

By default, this method is inherited by every object descended from Object.

Note: The reason for unwatch() to take the property name prop as its only parameter is due to the "single handler allowing" behavior of the watch() method.

Examples

See watch().

Specifications

Not part of any specifications. Implemented in JavaScript 1.2.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
unwatch
DeprecatedNon-standard
Chrome No support NoEdge No support NoFirefox No support 1 — 58IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support 4 — 58Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support Nonodejs No support No

Legend

No support  
No support
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

Compatibility notes

  • Calling unwatch() on the Document object throws a TypeError since Firefox 23 (bug 903332). This regression has been fixed with Firefox 27.

See also

Related Topics
  1. Standard built-in objects
  2. Object
  3. Properties
    1. Object.prototype
    2. Object.prototype.__count__
    3. Object.prototype.__noSuchMethod__
    4. Object.prototype.__parent__
    5. Object.prototype.__proto__
    6. Object.prototype.constructor
  4. Methods
    1. Object.assign()
    2. Object.create()
    3. Object.defineProperties()
    4. Object.defineProperty()
    5. Object.entries()
    6. Object.freeze()
    7. Object.fromEntries()
    8. Object.getNotifier()
    9. Object.getOwnPropertyDescriptor()
    10. Object.getOwnPropertyDescriptors()
    11. Object.getOwnPropertyNames()
    12. Object.getOwnPropertySymbols()
    13. Object.getPrototypeOf()
    14. Object.is()
    15. Object.isExtensible()
    16. Object.isFrozen()
    17. Object.isSealed()
    18. Object.keys()
    19. Object.observe()
    20. Object.preventExtensions()
    21. Object.prototype.__defineGetter__()
    22. Object.prototype.__defineSetter__()
    23. Object.prototype.__lookupGetter__()
    24. Object.prototype.__lookupSetter__()
    25. Object.prototype.eval()
    26. Object.prototype.hasOwnProperty()
    27. Object.prototype.isPrototypeOf()
    28. Object.prototype.propertyIsEnumerable()
    29. Object.prototype.toLocaleString()
    30. Object.prototype.toSource()
    31. Object.prototype.toString()
    32. Object.prototype.unwatch()
    33. Object.prototype.valueOf()
    34. Object.prototype.watch()
    35. Object.seal()
    36. Object.setPrototypeOf()
    37. Object.unobserve()
    38. Object.values()
  5. Inheritance:
  6. Function
  7. Properties
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.name
    7. Function.prototype
  8. Methods
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()