javascript - JQuery 与 extend (reduce objects) 相反

Question

我面临下一个问题，我可以合并/扩展对象并且工作得很好，但现在我需要做与扩展对象相反的事情，JQuery 文档:

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

// Merge object2 into object1, recursively
$.extend( true, object1, object2 );

// Result
{"apple":0,"banana":{"weight":52,"price":200},"cherry":97,"durian":100}

这很酷，而且效果很好，但是我如何获得相反的操作，例如获得这样的输出:

{"apple":0,"banana":{"weight":52},"cherry":97}

Answer 1

没有这样的函数，但是你可以自己写:

$.prototype.reduce = function reduce(obj1, obj2) {
  for (var k in obj2) {
    if (obj1.hasOwnProperty(k) && obj2.hasOwnProperty(k)) {
      if (typeof obj1[k] == "object" && typeof obj2[k] == "object") {
         reduce(obj1[k], obj2[k]);
      }
      else delete obj1[k];
    }
  }
}