javascript - Overriding inherited prototype method and calling the original one inside the new one -

in following piece of code, how can access a.prototype.log inside of b.prototype.log?

function a() {}  a.prototype.log = function () {     console.log("a"); };  function b() {}  b.prototype = object.create(a.prototype); b.prototype.constructor = b;  b.prototype.log = function () {     //call a.prototype.log here     console.log("b"); };  var b = new b(); b.log(); 

i know write a.prototype.log.call(this) thought maybe there more elegant way, lets me call in relative way, "call method 'log' of next higher instance in prototype chain". possible?

you use object.getprototypeof

... b.prototype.log = function () {     object.getprototypeof (b.prototype).log.call(this)     console.log("b"); }; ... b.log(); //a b 

note: object.getprototypeof ecmasript 5, see compatibility

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there non standard , deprecated __proto__ property (compatibility)

references same object internal [[prototype]]

and allow call as' log method this

b.prototype.__proto__.log.call(this)

but

the preferred method use object.getprototypeof.