这是对以上所有内容的补充，而不是替代。如果需要快速浅比较对象，而不需要检查额外的递归情况。这是一个镜头。

这比较:1)自己的属性数量相等，2)键名相等，3)如果bCompareValues == true，对应的属性值及其类型相等(三重相等)

var shallowCompareObjects = function(o1, o2, bCompareValues) {
    var s, 
        n1 = 0,
        n2 = 0,
        b  = true;

    for (s in o1) { n1 ++; }
    for (s in o2) { 
        if (!o1.hasOwnProperty(s)) {
            b = false;
            break;
        }
        if (bCompareValues && o1[s] !== o2[s]) {
            b = false;
            break;
        }
        n2 ++;
    }
    return b && n1 == n2;
}

不同。如果对象中键的顺序不重要，我不需要知道所述对象的原型。使用总是有用的。

const object = {};
JSON.stringify(object) === "{}" will pass but {} === "{}" will not

在React中，你可以使用' React -fast-compare'中的isEqual。这个答案可能不适用于纯JavaScript，但在使用React时可能有用。

console.log(isEqual({ hello: 'world' }, { hello: 'world' })) // returns true

React中最快的深度相等比较。非常快速的通用深度比较。非常适合React。备忘录和shouldComponentUpdate。

更多信息可以在这里找到:https://www.npmjs.com/package/react-fast-compare。

你是在测试两个对象是否相等吗?即:它们的属性是相等的?

如果是这样的话，你可能会注意到这种情况:

var a = { foo : "bar" };
var b = { foo : "bar" };
alert (a == b ? "Equal" : "Not equal");
// "Not equal"

你可能需要这样做:

function objectEquals(obj1, obj2) {
    for (var i in obj1) {
        if (obj1.hasOwnProperty(i)) {
            if (!obj2.hasOwnProperty(i)) return false;
            if (obj1[i] != obj2[i]) return false;
        }
    }
    for (var i in obj2) {
        if (obj2.hasOwnProperty(i)) {
            if (!obj1.hasOwnProperty(i)) return false;
            if (obj1[i] != obj2[i]) return false;
        }
    }
    return true;
}

显然，该函数可以进行相当多的优化，并能够进行深度检查(处理嵌套对象:var a = {foo: {fu: "bar"}})，但您可以理解。

正如FOR所指出的，你可能需要根据自己的目的进行调整，例如:不同的类可能对“equal”有不同的定义。如果您只是处理普通对象，上述方法可能就足够了，否则可以使用自定义MyClass.equals()函数。

这是一个非常干净的CoffeeScript版本，你可以这样做:

Object::equals = (other) ->
  typeOf = Object::toString

  return false if typeOf.call(this) isnt typeOf.call(other)
  return `this == other` unless typeOf.call(other) is '[object Object]' or
                                typeOf.call(other) is '[object Array]'

  (return false unless this[key].equals other[key]) for key, value of this
  (return false if typeof this[key] is 'undefined') for key of other

  true

下面是测试:

  describe "equals", ->

    it "should consider two numbers to be equal", ->
      assert 5.equals(5)

    it "should consider two empty objects to be equal", ->
      assert {}.equals({})

    it "should consider two objects with one key to be equal", ->
      assert {a: "banana"}.equals {a: "banana"}

    it "should consider two objects with keys in different orders to be equal", ->
      assert {a: "banana", kendall: "garrus"}.equals {kendall: "garrus", a: "banana"}

    it "should consider two objects with nested objects to be equal", ->
      assert {a: {fruit: "banana"}}.equals {a: {fruit: "banana"}}

    it "should consider two objects with nested objects that are jumbled to be equal", ->
      assert {a: {a: "banana", kendall: "garrus"}}.equals {a: {kendall: "garrus", a: "banana"}}

    it "should consider two objects with arrays as values to be equal", ->
      assert {a: ["apple", "banana"]}.equals {a: ["apple", "banana"]}



    it "should not consider an object to be equal to null", ->
      assert !({a: "banana"}.equals null)

    it "should not consider two objects with different keys to be equal", ->
      assert !({a: "banana"}.equals {})

    it "should not consider two objects with different values to be equal", ->
      assert !({a: "banana"}.equals {a: "grapefruit"})

下面的一些解决方案在性能、功能和风格方面存在问题……它们没有经过充分的考虑，其中一些在不同的情况下失败了。我试图在自己的解决方案中解决这个问题，我非常感谢您的反馈:

http://stamat.wordpress.com/javascript-object-comparison/

//Returns the object's class, Array, Date, RegExp, Object are of interest to us
var getClass = function(val) {
    return Object.prototype.toString.call(val)
        .match(/^\[object\s(.*)\]$/)[1];
};

//Defines the type of the value, extended typeof
var whatis = function(val) {

    if (val === undefined)
        return 'undefined';
    if (val === null)
        return 'null';

    var type = typeof val;

    if (type === 'object')
        type = getClass(val).toLowerCase();

    if (type === 'number') {
        if (val.toString().indexOf('.') > 0)
            return 'float';
        else
        return 'integer';
    }

    return type;
   };

var compareObjects = function(a, b) {
    if (a === b)
        return true;
    for (var i in a) {
        if (b.hasOwnProperty(i)) {
            if (!equal(a[i],b[i])) return false;
        } else {
            return false;
        }
    }

    for (var i in b) {
        if (!a.hasOwnProperty(i)) {
            return false;
        }
    }
    return true;
};

var compareArrays = function(a, b) {
    if (a === b)
        return true;
    if (a.length !== b.length)
        return false;
    for (var i = 0; i < a.length; i++){
        if(!equal(a[i], b[i])) return false;
    };
    return true;
};

var _equal = {};
_equal.array = compareArrays;
_equal.object = compareObjects;
_equal.date = function(a, b) {
    return a.getTime() === b.getTime();
};
_equal.regexp = function(a, b) {
    return a.toString() === b.toString();
};
//  uncoment to support function as string compare
//  _equal.fucntion =  _equal.regexp;



/*
 * Are two values equal, deep compare for objects and arrays.
 * @param a {any}
 * @param b {any}
 * @return {boolean} Are equal?
 */
var equal = function(a, b) {
    if (a !== b) {
        var atype = whatis(a), btype = whatis(b);

        if (atype === btype)
            return _equal.hasOwnProperty(atype) ? _equal[atype](a, b) : a==b;

        return false;
    }

    return true;
};