md/js/比对.js

/*
 * @Description: 
 * @Autor: kindring
 * @Date: 2021-09-30 10:36:44
 * @LastEditors: kindring
 * @LastEditTime: 2021-09-30 14:34:37
 * @LastDescript: 
 */


// 判断最终值是否相同
function isEqual(obj1, obj2) {
    if (obj1 instanceof Array) {
        if (obj1.length != obj2.length) {
            return false
        }
        for (let index = 0; index < obj1.length; index++) {
            if (obj1[index] instanceof Object) {
                if (!isEqual(obj1[index], obj2[index])) {
                    return false
                }
            } else {
                if (obj1[index] != obj2[index]) {
                    return false
                }
            }
        }
    } else if (obj1 instanceof Object) {
        if (Object.keys(obj1).length != Object.keys(obj2).length) {
            console.log('对象值数量不一致');
            return false
        }
        for (let key in obj1) {
            // 防止循环引用
            if (obj1[key] instanceof Object) {
                if (!isEqual(obj1[key], obj2[key])) {
                    return false
                }
            } else {
                if (obj1[key] != obj2[key]) {
                    return false
                }
            }
        }
    } else {
        return obj1 == obj2
    }
    return true
}

console.log(isEqual(1, 2)); // false
console.log(isEqual([1, 2], [1, 2])); // true
console.log(isEqual([1], [1, 2])); // false
console.log(isEqual([{ a: 1, b: 2 }], [{ a: 1, b: 2 }])); // true
console.log(isEqual([{ a: 1, b: 2 }], [{ a: 1, b: 1 }])); // false
console.log(isEqual([{ a: 1, b: 2 }], [{ a: 1 }])); // false
console.log(isEqual({ a: 1, b: 2, c: [1, 2] }, { a: 1, b: 2, c: [1, 2] })); // true



function deepClone(object, weakMap = new WeakMap()) {
    if (typeof object === 'object') {
        let cloneTarget = Array.isArray(object) ? [] : {}
        if (weakMap.get(object)) {
            return weakMap.get(object)
        }
        weakMap.set(object, cloneTarget)
        for (const key in object) {
            cloneTarget[key] = deepClone(object[key], weakMap)
        }
        return cloneTarget
    } else {
        return object
    }
}

let o1 = { a: 1, b: [{ c: 2, d: 3 }] }
console.log(o1);
let o2 = deepClone(o1)
console.log(o2);
o1.a = 3;
console.log(o2);