var Foo = function Foo(){}; Foo.prototype.x = 1; var FooInstance = new Foo(); console.log(FooInstance.x); // logs 1, as you think it would //now let’s replace/override the prototype object with a new Object() object Foo.prototype = {x:2}; console.log(FooInstance.x); // logs 1: once created, object's __proto__ never changes // create a new instance of Foo() var NewFooInstance = new Foo(); console.log(NewFooInstance.x); // logs 2
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