严格相等运算符将告诉您两个对象类型是否相等。然而,是否有一种方法来判断两个对象是否相等,就像Java中的哈希码值一样?

堆栈溢出问题JavaScript中有hashCode函数吗?类似于这个问题,但需要一个更学术的答案。上面的场景说明了为什么有必要有一个,我想知道是否有等效的解决方案。


当前回答

这取决于你对平等的定义。因此,作为类的开发人员,要由您来定义它们的相等性。

有时会使用一种情况,如果两个实例指向内存中的相同位置,则认为它们是“相等的”,但这并不总是您想要的。例如,如果我有一个Person类,如果两个Person对象具有相同的Last Name、First Name和Social Security Number(即使它们指向内存中的不同位置),我可能会认为它们是“相等的”。

另一方面,我们不能简单地说两个对象是相等的,如果它们的每个成员的值都相同,因为,有时,你并不想这样。换句话说,对于每个类,由类开发人员定义组成对象“标识”的成员并开发适当的相等操作符(通过重载==操作符或Equals方法)。

Saying that two objects are equal if they have the same hash is one way out. However you then have to wonder how the hash is calculated for each instance. Going back to the Person example above, we could use this system if the hash was calculated by looking at the values of the First Name, Last Name, and Social Security Number fields. On top of that, we are then relying on the quality of the hashing method (that's a huge topic on its own, but suffice it to say that not all hashes are created equal, and bad hashing methods can lead to more collisions, which in this case would return false matches).

其他回答

是的,另一个答案……

Object.prototype.equals = function (object) { if (this.constructor !== object.constructor) return false; if (Object.keys(this).length !== Object.keys(object).length) return false; var obk; for (obk in object) { if (this[obk] !== object[obk]) return false; } return true; } var aaa = JSON.parse('{"name":"mike","tel":"1324356584"}'); var bbb = JSON.parse('{"tel":"1324356584","name":"mike"}'); var ccc = JSON.parse('{"name":"mike","tel":"584"}'); var ddd = JSON.parse('{"name":"mike","tel":"1324356584", "work":"nope"}'); $("#ab").text(aaa.equals(bbb)); $("#ba").text(bbb.equals(aaa)); $("#bc").text(bbb.equals(ccc)); $("#ad").text(aaa.equals(ddd)); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> aaa equals bbb? <span id="ab"></span> <br/> bbb equals aaa? <span id="ba"></span> <br/> bbb equals ccc? <span id="bc"></span> <br/> aaa equals ddd? <span id="ad"></span>

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;
}

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"})

下面是stringify技巧的一个版本,它的输入较少,在很多情况下适用于简单的JSON数据比较。

var obj1Fingerprint = JSON.stringify(obj1).replace(/\{|\}/g,'').split(',').sort().join(',');
var obj2Fingerprint = JSON.stringify(obj2).replace(/\{|\}/g,'').split(',').sort().join(',');
if ( obj1Fingerprint === obj2Fingerprint) { ... } else { ... }

纯JS方法:我的答案是基于生成一个返回相同值的字符串,无论属性顺序是否相同。设置对象可用于切换大小写和空白是否重要。(为了避免失去焦点,我没有包括那些支持函数,或者我猜应该在任何实用程序集中的isObject。)

这里也没有显示,但为了减少字符串比较时间,如果对象很大,你想加快比较,你也可以散列字符串和比较子字符串;这只适用于非常大的对象(当然也有很小的机会出现错误的相等)。

然后你可以比较genObjStr(obj1) ?= genObjStr(obj2)

function genObjStr(obj, settings) {
// Generate a string that corresponds to an object guarenteed to be the same str even if
// the object have different ordering. The string would largely be used for comparison purposes

var settings = settings||{};
var doStripWhiteSpace = defTrue(settings.doStripWhiteSpace);
var doSetLowerCase = settings.doSetLowerCase||false;

if(isArray(obj)) {
    var vals = [];
    for(var i = 0; i < obj.length; ++i) {
        vals.push(genObjStr(obj[i], settings));
    }
    vals = arraySort(vals);
    return vals.join(`,`);

} else if(isObject(obj)) {

    var keys = Object.keys(obj);
    keys = arraySort(keys);

    var vals = [];
    for(var key of keys) {
        
        var value = obj[key];
        
        value = genObjStr(value, settings);

        if(doStripWhiteSpace) {
            key = removeWhitespace(key);
            var value = removeWhitespace(value);
        };
        if(doSetLowerCase) {
            key = key.toLowerCase();
            value = value.toLowerCase();
        }

        vals.push(value);
    }
    var str = JSON.stringify({keys: keys, vals: vals});
    return str
} else {
    if(doStripWhiteSpace) {
        obj = removeWhitespace(obj);
    };
    if(doSetLowerCase) {
        obj = obj.toLowerCase();
    }
    return obj
}

}

var obj1 = {foo: 123, bar: `Test`};
var obj2 = {bar: `Test`, foo: 123};

console.log(genObjStr(obj1) == genObjStr(obj1))