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Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The __lookupGetter__ method returns the function bound as a getter to the specified property.

Syntax

obj.__lookupGetter__(sprop)

Parameters

sprop
A string containing the name of the property whose getter should be returned.

Return value

The function bound as a getter to the specified property.

Description

If a getter has been defined for an object's property, it's not possible to reference the getter function through that property, because that property refers to the return value of that function. __lookupGetter__ can be used to obtain a reference to the getter function.

It is now possible to do this in a standardized way using Object.getOwnPropertyDescriptor() and Object.getPrototypeOf().

Examples

var obj = {
  get foo() {
    return Math.random() > 0.5 ? 'foo' : 'bar';
  }
};


// Non-standard and deprecated way
obj.__lookupGetter__('foo');
// (function() { return Math.random() > 0.5 ? 'foo' : 'bar'; })


// Standard-compliant way
Object.getOwnPropertyDescriptor(obj, "foo").get;
// (function() { return Math.random() > 0.5 ? 'foo' : 'bar'; })

Specifications

Specification Status Comment
ECMAScript Latest Draft (ECMA-262)
The definition of 'Object.prototype.__lookupGetter__()' in that specification.
Draft Included in the (normative) annex for additional ECMAScript legacy features for Web browsers (note that the specification codifies what is already in implementations).

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic support
Deprecated
Chrome Full support YesEdge Full support YesFirefox Full support 1IE Full support 11Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

See also

Schlagwörter des Dokuments und Mitwirkende

Zuletzt aktualisiert von: fscholz,