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This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.

Los __lookupGetter__ metodos retornan la funcion  enlazada como un getter para especificar la propiedad.




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.


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().


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

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

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


Specification Status Comment
ECMAScript (ECMA-262)
La definición de 'Object.prototype.__lookupGetter__()' en esta especificación.
Living Standard 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
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome para AndroidFirefox para AndroidOpera para AndroidSafari en iOSSamsung InternetNode.js
Chrome Soporte completo 1Edge Soporte completo 12Firefox Soporte completo 1IE Soporte completo 11Opera Soporte completo 9.5Safari Soporte completo 3WebView Android Soporte completo 1Chrome Android Soporte completo 18Firefox Android Soporte completo 4Opera Android Soporte completo 10.1Safari iOS Soporte completo 1Samsung Internet Android Soporte completo 1.0nodejs Soporte completo Si


Soporte completo  
Soporte completo
Deprecado. No debe ser usado en nuevos sitios web.
Deprecado. No debe ser usado en nuevos sitios web.

See also