如今，有相当多的模块可用于此。我最近写了一个模块来做到这一点，因为我不满意我发现的大量不同的模块。它被称为odiff: https://github.com/Tixit/odiff。我还列出了一些最流行的模块，以及为什么它们不能在odiff的自述中被接受，如果odiff没有你想要的属性，你可以查看一下。这里有一个例子:

var a = [{a:1,b:2,c:3},              {x:1,y: 2, z:3},              {w:9,q:8,r:7}]
var b = [{a:1,b:2,c:3},{t:4,y:5,u:6},{x:1,y:'3',z:3},{t:9,y:9,u:9},{w:9,q:8,r:7}]

var diffs = odiff(a,b)

/* diffs now contains:
[{type: 'add', path:[], index: 2, vals: [{t:9,y:9,u:9}]},
 {type: 'set', path:[1,'y'], val: '3'},
 {type: 'add', path:[], index: 1, vals: [{t:4,y:5,u:6}]}
]
*/

const diff = require("deep-object-diff").diff;
let differences = diff(obj2, obj1);

有一个每周下载量超过50万的npm模块:https://www.npmjs.com/package/deep-object-diff

我喜欢对象式的差异表示-特别是当它形成时，很容易看到结构。

const diff = require("deep-object-diff").diff;

const lhs = {
  foo: {
    bar: {
      a: ['a', 'b'],
      b: 2,
      c: ['x', 'y'],
      e: 100 // deleted
    }
  },
  buzz: 'world'
};

const rhs = {
  foo: {
    bar: {
      a: ['a'], // index 1 ('b')  deleted
      b: 2, // unchanged
      c: ['x', 'y', 'z'], // 'z' added
      d: 'Hello, world!' // added
    }
  },
  buzz: 'fizz' // updated
};

console.log(diff(lhs, rhs)); // =>
/*
{
  foo: {
    bar: {
      a: {
        '1': undefined
      },
      c: {
        '2': 'z'
      },
      d: 'Hello, world!',
      e: undefined
    }
  },
  buzz: 'fizz'
}
*/

我已经使用这段代码来完成你所描述的任务:

function mergeRecursive(obj1, obj2) {
    for (var p in obj2) {
        try {
            if(obj2[p].constructor == Object) {
                obj1[p] = mergeRecursive(obj1[p], obj2[p]);
            }
            // Property in destination object set; update its value.
            else if (Ext.isArray(obj2[p])) {
                // obj1[p] = [];
                if (obj2[p].length < 1) {
                    obj1[p] = obj2[p];
                }
                else {
                    obj1[p] = mergeRecursive(obj1[p], obj2[p]);
                }

            }else{
                obj1[p] = obj2[p];
            }
        } catch (e) {
            // Property in destination object not set; create it and set its value.
            obj1[p] = obj2[p];
        }
    }
    return obj1;
}

这将为您提供一个新对象，该对象将合并窗体中的旧对象和新对象之间的所有更改

我想提供一个ES6解决方案…这是一个单向的diff，意味着它将返回来自o2的键/值，这些键/值与o1中的对应键/值不相同:

let o1 = {
  one: 1,
  two: 2,
  three: 3
}

let o2 = {
  two: 2,
  three: 3,
  four: 4
}

let diff = Object.keys(o2).reduce((diff, key) => {
  if (o1[key] === o2[key]) return diff
  return {
    ...diff,
    [key]: o2[key]
  }
}, {})

这是在gisthub上找到的一个修改版本。

isNullBlankOrUndefined = function (o) {
    return (typeof o === "undefined" || o == null || o === "");
}

/**
 * Deep diff between two object, using lodash
 * @param  {Object} object Object compared
 * @param  {Object} base   Object to compare with
 * @param  {Object} ignoreBlanks will not include properties whose value is null, undefined, etc.
 * @return {Object}        Return a new object who represent the diff
 */
objectDifference = function (object, base, ignoreBlanks = false) {
    if (!lodash.isObject(object) || lodash.isDate(object)) return object            // special case dates
    return lodash.transform(object, (result, value, key) => {
        if (!lodash.isEqual(value, base[key])) {
            if (ignoreBlanks && du.isNullBlankOrUndefined(value) && isNullBlankOrUndefined( base[key])) return;
            result[key] = lodash.isObject(value) && lodash.isObject(base[key]) ? objectDifference(value, base[key]) : value;
        }
    });
}

这里有一个解决方案:

TypeScript(但很容易转换为JavaScript) 没有lib依赖项 泛型的，不关心检查对象类型(除了对象类型) 支持值为undefined的属性 深度不(默认)

首先，我们定义比较结果接口:

export interface ObjectDiff {
  added: {} | ObjectDiff;
  updated: {
    [propName: string]: Update | ObjectDiff;
  };
  removed: {} | ObjectDiff;
  unchanged: {} | ObjectDiff;
}

对于change的特殊情况，我们想知道什么是旧值和新值:

export interface Update {
  oldValue: any;
  newValue: any;
}

然后我们可以提供只有两个循环的diff函数(如果deep为真，则具有递归性):

export class ObjectUtils {
  /**
   * @return if obj is an Object, including an Array.
   */
  static isObject(obj: any) {
    return obj !== null && typeof obj === 'object';
  }

  /**
   * @param oldObj The previous Object or Array.
   * @param newObj The new Object or Array.
   * @param deep If the comparison must be performed deeper than 1st-level properties.
   * @return A difference summary between the two objects.
   */
  static diff(oldObj: {}, newObj: {}, deep = false): ObjectDiff {
    const added = {};
    const updated = {};
    const removed = {};
    const unchanged = {};
    for (const oldProp in oldObj) {
      if (oldObj.hasOwnProperty(oldProp)) {
        const newPropValue = newObj[oldProp];
        const oldPropValue = oldObj[oldProp];
        if (newObj.hasOwnProperty(oldProp)) {
          if (newPropValue === oldPropValue) {
            unchanged[oldProp] = oldPropValue;
          } else {
            updated[oldProp] = deep && this.isObject(oldPropValue) && this.isObject(newPropValue) ? this.diff(oldPropValue, newPropValue, deep) : {newValue: newPropValue};
          }
        } else {
          removed[oldProp] = oldPropValue;
        }
      }
    }
    for (const newProp in newObj) {
      if (newObj.hasOwnProperty(newProp)) {
        const oldPropValue = oldObj[newProp];
        const newPropValue = newObj[newProp];
        if (oldObj.hasOwnProperty(newProp)) {
          if (oldPropValue !== newPropValue) {
            if (!deep || !this.isObject(oldPropValue)) {
              updated[newProp].oldValue = oldPropValue;
            }
          }
        } else {
          added[newProp] = newPropValue;
        }
      }
    }
    return {added, updated, removed, unchanged};
  }
}

例如，调用:

ObjectUtils.diff(
  {
    a: 'a', 
    b: 'b', 
    c: 'c', 
    arr: ['A', 'B'], 
    obj: {p1: 'p1', p2: 'p2'}
  },
  {
    b: 'x', 
    c: 'c', 
    arr: ['B', 'C'], 
    obj: {p2: 'p2', p3: 'p3'}, 
    d: 'd'
  },
);

将返回:

{
  added: {d: 'd'},
  updated: {
    b: {oldValue: 'b', newValue: 'x'},
    arr: {oldValue: ['A', 'B'], newValue: ['B', 'C']},
    obj: {oldValue: {p1: 'p1', p2: 'p2'}, newValue: {p2: 'p2', p3: 'p3'}}
  },
  removed: {a: 'a'},
  unchanged: {c: 'c'},
}

对deep third参数调用同样的方法将返回:

{
  added: {d: 'd'},
  updated: {
    b: {oldValue: 'b', newValue: 'x'},
    arr: {
      added: {},
      removed: {},
      unchanged: {},
      updated: {
        0: {oldValue: 'A', newValue: 'B'},
        1: {oldValue: 'B', newValue: 'C', }
      }
    },
    obj: {
      added: {p3: 'p3'},
      removed: {p1: 'p1'},
      unchanged: {p2: 'p2'},
      updated: {}
    }
  },
  removed: {a: 'a'},
  unchanged: {c: 'c'},
}