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
简而言之，这将检查两个变量是否相等，无论其类型如何。
function isSame (obj1, obj2) {
const obj1Keys = Object.keys(obj1)
const obj2Keys = Object.keys(obj2)
return obj1Keys.length === obj2Keys.length && obj1Keys.every((key) => obj1[key] === obj2[key])
}
其他回答
当然，当我们在它的时候，我会抛出我自己对车轮的重新发明(我为辐条和使用的材料的数量感到自豪):
////////////////////////////////////////////////////////////////////////////////
var equals = function ( objectA, objectB ) {
var result = false,
keysA,
keysB;
// Check if they are pointing at the same variable. If they are, no need to test further.
if ( objectA === objectB ) {
return true;
}
// Check if they are the same type. If they are not, no need to test further.
if ( typeof objectA !== typeof objectB ) {
return false;
}
// Check what kind of variables they are to see what sort of comparison we should make.
if ( typeof objectA === "object" ) {
// Check if they have the same constructor, so that we are comparing apples with apples.
if ( objectA.constructor === objectA.constructor ) {
// If we are working with Arrays...
if ( objectA instanceof Array ) {
// Check the arrays are the same length. If not, they cannot be the same.
if ( objectA.length === objectB.length ) {
// Compare each element. They must be identical. If not, the comparison stops immediately and returns false.
return objectA.every(
function ( element, i ) {
return equals( element, objectB[ i ] );
}
);
}
// They are not the same length, and so are not identical.
else {
return false;
}
}
// If we are working with RegExps...
else if ( objectA instanceof RegExp ) {
// Return the results of a string comparison of the expression.
return ( objectA.toString() === objectB.toString() );
}
// Else we are working with other types of objects...
else {
// Get the keys as arrays from both objects. This uses Object.keys, so no old browsers here.
keysA = Object.keys( objectA );
keysB = Object.keys( objectB );
// Check the key arrays are the same length. If not, they cannot be the same.
if ( keysA.length === keysB.length ) {
// Compare each property. They must be identical. If not, the comparison stops immediately and returns false.
return keysA.every(
function ( element ) {
return equals( objectA[ element ], objectB[ element ] );
}
);
}
// They do not have the same number of keys, and so are not identical.
else {
return false;
}
}
}
// They don't have the same constructor.
else {
return false;
}
}
// If they are both functions, let us do a string comparison.
else if ( typeof objectA === "function" ) {
return ( objectA.toString() === objectB.toString() );
}
// If a simple variable type, compare directly without coercion.
else {
return ( objectA === objectB );
}
// Return a default if nothing has already been returned.
return result;
};
////////////////////////////////////////////////////////////////////////////////
它会尽可能快地返回false，但当然，对于一个差异嵌套很深的大对象，它可能不那么有效。在我自己的场景中，良好地处理嵌套数组非常重要。
希望它能帮助需要这种“轮子”的人。
我写了一个运行在Node.js和浏览器上的小库，叫做compare.js。它提供了常见的比较运算符，例如==，!=，>，>=，<，<=和所有JavaScript数据类型的标识符。
例如，你可以用
cmp.eq(obj1, obj2);
这将检查是否相等(使用深度相等的方法)。否则，如果你这样做
cmp.id(obj1, obj2);
它将通过引用进行比较，从而检查标识。 您还可以在对象上使用<和>，它们表示子集和超集。
Compare.js被近700个单元测试覆盖，因此它应该不会有太多的bug;-)。
你可以在https://github.com/goloroden/compare.js上免费找到它，它是MIT许可下的开源软件。
这里有一个非常基本的方法来检查对象的“值是否相等”。
var john = {
occupation: "Web Developer",
age: 25
};
var bobby = {
occupation: "Web Developer",
age: 25
};
function isEquivalent(a, b) {
// Create arrays of property names
var aProps = Object.getOwnPropertyNames(a);
var bProps = Object.getOwnPropertyNames(b);
// If number of properties is different, objects are not equivalent
if (aProps.length != bProps.length) {
return false;
}
for (var i = 0; i < aProps.length; i++) {
var propName = aProps[i];
// If values of same property are not equal, objects are not equivalent
if (a[propName] !== b[propName]) {
return false;
}
}
// If we made it this far, objects are considered equivalent
return true;
}
// Outputs: true
console.log(isEquivalent(john, bobby));
演示 - JSFiddle
如你所见，为了检查对象的“值是否相等”，我们本质上必须遍历对象中的每个属性，以查看它们是否相等。虽然这个简单的实现适用于我们的示例，但有很多情况它无法处理。例如:
如果其中一个属性值本身就是一个对象呢? 如果属性值之一是NaN(中唯一的值 JavaScript不等于它自己?) 如果a有一个值为undefined的属性，而b没有呢 这个属性(因此计算为undefined?)
对于一个健壮的检查对象“值是否相等”的方法，最好依赖于一个经过良好测试的库，它涵盖了各种边缘情况，如下划线。
var john = {
occupation: "Web Developer",
age: 25
};
var bobby = {
occupation: "Web Developer",
age: 25
};
// Outputs: true
console.log(_.isEqual(john, bobby));
演示 - JSFiddle
简单来说:
const compare = (x, y) => {
const srt = (obj) => JSON.stringify(obj)?.split('').sort().join('');
return srt(x) === srt(y);
};
// ----- How to use ---
const a = {'one':1, 'two':2,'three':3};
const b = {'two':2, 'one':1, 'three':3}; //note same values as (const a)
const c = {'one':1, 'two':2,'three':3};
const d = {'one':1, 'two':2,'four':4};
compare(a, b); //true
compare(a, c); //true
compare(a, d); //false
//----- BUT! -----
JSON.stringify(a) === JSON.stringify(b); //false
//----- AND -----
compare({}, {}); //true
compare({}, undefined); //false
compare(undefined, undefined); //true
compare(undefined, ''); //false
compare(undefined, null); //false
compare(null, null); //true
compare('', ''); //true
let user1 = { name: "John", address: { line1: "55 Green Park Road", line2: { a:[1,2,3] } }, email:null } let user2 = { name: "John", address: { line1: "55 Green Park Road", line2: { a:[1,2,3] } }, email:null } // Method 1 function isEqual(a, b) { return JSON.stringify(a) === JSON.stringify(b); } // Method 2 function isEqual(a, b) { // checking type of a And b if(typeof a !== 'object' || typeof b !== 'object') { return false; } // Both are NULL if(!a && !b ) { return true; } else if(!a || !b) { return false; } let keysA = Object.keys(a); let keysB = Object.keys(b); if(keysA.length !== keysB.length) { return false; } for(let key in a) { if(!(key in b)) { return false; } if(typeof a[key] === 'object') { if(!isEqual(a[key], b[key])) { return false; } } else { if(a[key] !== b[key]) { return false; } } } return true; } console.log(isEqual(user1,user2));
