Stringify两个对象并进行比较

返回(JSON.stringify(obj1) === = JSON.stringify(obj2))

这将返回true或false

判断两个对象是否相似的一个快速“破解”方法是使用它们的toString()方法。如果您正在检查对象A和B，请确保A和B具有有意义的toString()方法，并检查它们返回的字符串是否相同。

这不是灵丹妙药，但有时在正确的情况下是有用的。

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;
}

EDIT: This method is quite flawed, and is rife with its own issues. I don't recommend it, and would appreciate some down-votes! It is problematic because 1) Some things can not be compared (i.e. functions) because they can not be serialized, 2) It isn't a very fast method of comparing, 3) It has ordering issues, 4) It can have collision issues/false positives if not properly implemented, 5) It can't check for "exactness" (===), and instead is based of value equality, which is oftentimes not what is desired in a comparison method.

这个问题的一个简单解决方案是对JSON字符串进行排序(每个字符)，但很多人没有意识到这一点。这通常也比这里提到的其他解决方案更快:

function areEqual(obj1, obj2) {
    var a = JSON.stringify(obj1), b = JSON.stringify(obj2);
    if (!a) a = '';
    if (!b) b = '';
    return (a.split('').sort().join('') == b.split('').sort().join(''));
}

关于这个方法的另一个有用的事情是，您可以通过向JSON传递一个“replace”函数来筛选比较。stringify函数(https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#Example_of_using_replacer_parameter)。下面只比较所有命名为“derp”的对象键:

function areEqual(obj1, obj2, filter) {
    var a = JSON.stringify(obj1, filter), b = JSON.stringify(obj2, filter);
    if (!a) a = '';
    if (!b) b = '';
    return (a.split('').sort().join('') == b.split('').sort().join(''));
}
var equal = areEqual(obj1, obj2, function(key, value) {
    return (key === 'derp') ? value : undefined;
});

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));

let std1 = {
  name: "Abhijeet",
  roll: 1
}

let std2 = {
  name: "Siddharth",
  roll: 2
}

console.log(JSON.stringify(std1) === JSON.stringify(std2))