Javascript default object method [duplicate]

Is there a way how to create a default method call when the method that is called from object is undefined?

e.g.

myObj = {
   default: function(){ 
      console.log("You've called method that isn't defined");
   },
   sayHi: function(){ 
      console.log("myObj says Hi!");
   }
}

//console output: "myObj says Hi!"
myObj.sayHi();

//console output: "You've called method that isn't defined"
myObj.methodThatIsNotReallyThere();