我有2个不同的嵌套对象,我需要知道它们是否在其中一个嵌套属性中有不同。

var a = {};
var b = {};

a.prop1 = 2;
a.prop2 = { prop3: 2 };

b.prop1 = 2;
b.prop2 = { prop3: 3 };

对象可以更复杂,有更多嵌套的属性。但这是一个很好的例子。我可以选择使用递归函数或lodash的东西…


当前回答

var isEqual = function(f,s) {
  if (f === s) return true;

  if (Array.isArray(f)&&Array.isArray(s)) {
    return isEqual(f.sort(), s.sort());
  }
  if (_.isObject(f)) {
    return isEqual(f, s);
  }
  return _.isEqual(f, s);
};

其他回答

深度比较使用模板的(嵌套)属性进行检查

function objetcsDeepEqualByTemplate(objectA, objectB, comparisonTemplate) {
  if (!objectA || !objectB) return false

  let areDifferent = false
  Object.keys(comparisonTemplate).some((key) => {
    if (typeof comparisonTemplate[key] === 'object') {
      areDifferent = !objetcsDeepEqualByTemplate(objectA[key], objectB[key], comparisonTemplate[key])
      return areDifferent
    } else if (comparisonTemplate[key] === true) {
      areDifferent = objectA[key] !== objectB[key]
      return areDifferent
    } else {
      return false
    }
  })

  return !areDifferent
}

const objA = { 
  a: 1,
  b: {
    a: 21,
    b: 22,
  },
  c: 3,
}

const objB = { 
  a: 1,
  b: {
    a: 21,
    b: 25,
  },
  c: true,
}

// template tells which props to compare
const comparisonTemplateA = {
  a: true,
  b: {
    a: true
  }
}
objetcsDeepEqualByTemplate(objA, objB, comparisonTemplateA)
// returns true

const comparisonTemplateB = {
  a: true,
  c: true
}
// returns false
objetcsDeepEqualByTemplate(objA, objB, comparisonTemplateB)

这将在控制台中工作。如果需要,可以添加数组支持

一个简单而优雅的解决方案是使用_。isEqual,它执行深度比较:

Var a = {}; Var b = {}; A.prop1 = 2; A.prop2 = {prop3: 2}; B.prop1 = 2; B.prop2 = {prop3: 3}; console.log(_。isEqual (a, b));//如果不同则返回false < script src = " https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js " > < /脚本>

然而,这个解决方案并没有显示哪个属性是不同的。

我尝试了Adam Boduch的代码来输出一个很深的差异-这完全没有经过测试,但碎片在那里:

function diff (obj1, obj2, path) {
    obj1 = obj1 || {};
    obj2 = obj2 || {};

    return _.reduce(obj1, function(result, value, key) {
        var p = path ? path + '.' + key : key;
        if (_.isObject(value)) {
            var d = diff(value, obj2[key], p);
            return d.length ? result.concat(d) : result;
        }
        return _.isEqual(value, obj2[key]) ? result : result.concat(p);
    }, []);
}

diff({ foo: 'lol', bar: { baz: true }}, {}) // returns ["foo", "bar.baz"]

在没有使用lodash/下划线的情况下,我已经编写了这段代码,并且可以很好地对object1和object2进行深入比较

function getObjectDiff(a, b) {
    var diffObj = {};
    if (Array.isArray(a)) {
        a.forEach(function(elem, index) {
            if (!Array.isArray(diffObj)) {
                diffObj = [];
            }
            diffObj[index] = getObjectDiff(elem, (b || [])[index]);
        });
    } else if (a != null && typeof a == 'object') {
        Object.keys(a).forEach(function(key) {
            if (Array.isArray(a[key])) {
                var arr = getObjectDiff(a[key], b[key]);
                if (!Array.isArray(arr)) {
                    arr = [];
                }
                arr.forEach(function(elem, index) {
                    if (!Array.isArray(diffObj[key])) {
                        diffObj[key] = [];
                    }
                    diffObj[key][index] = elem;
                });
            } else if (typeof a[key] == 'object') {
                diffObj[key] = getObjectDiff(a[key], b[key]);
            } else if (a[key] != (b || {})[key]) {
                diffObj[key] = a[key];
            } else if (a[key] == (b || {})[key]) {
                delete a[key];
            }
        });
    }
    Object.keys(diffObj).forEach(function(key) {
        if (typeof diffObj[key] == 'object' && JSON.stringify(diffObj[key]) == '{}') {
            delete diffObj[key];
        }
    });
    return diffObj;
}

以Sridhar Gudimela的回答为基础,下面以一种使用TypeScript的方式进行了更新:

///  U T I L S

interface LooseObjectInterface {
  [key: string]: any;
};

type inputOptions = LooseObjectInterface | any[];



///  E X P O R T

export const objectCompare = (objectA: inputOptions, objectB: inputOptions): LooseObjectInterface => {
  let diffObj: LooseObjectInterface = {};

  switch(true) {
    case (Array.isArray(objectA)):
      objectA.forEach((elem: any, index: number) => {
        if (!Array.isArray(diffObj))
          diffObj = [];

        diffObj[index] = objectCompare(elem, (objectB || [])[index]);
      });

      break;

    case (objectA !== null && typeof objectA === "object"):
      Object.keys(objectA).forEach((key: any) => {
        if (Array.isArray(objectA[key])) {
          let arr = objectCompare(objectA[key], objectB[key]);

          if (!Array.isArray(arr))
            arr = [];

          arr.forEach((elem: any, index: number) => {
            if (!Array.isArray(diffObj[key]))
              diffObj[key] = [];

            diffObj[key][index] = elem;
          });
        } else if (typeof objectA[key] === "object")
          diffObj[key] = objectCompare(objectA[key], objectB[key]);
        else if (objectA[key] !== (objectB || {})[key])
          diffObj[key] = objectA[key];
        else if (objectA[key] === (objectB || {})[key])
          delete objectA[key];
      });

      break;

    default:
      break;
  }

  Object.keys(diffObj).forEach((key: any) => {
    if (typeof diffObj[key] === "object" && JSON.stringify(diffObj[key]) === "{}")
      delete diffObj[key];
  });

  return diffObj;
};

编辑:我最初的回答使用了Flow,因此被否决了(我猜,或者可能是因为我的回答没有使用Lodash……)然而,有一个类似问题的答案也无妨)。