var object1 = {
  apple: 0,
  banana: {weight: 52, price: 100},
  cherry: 97
};
var object2 = {
  banana: {price: 200},
  durian: 100
};

/* merge object2 into object1 */
$.extend(object1, object2, true);

// Output (no durian!):
// { apple: 0, banana: { price: 200 }, cherry: 97 }