对象类型的深入比较

const _ = require('lodash');

const obj1 = { a: 1, b: { c: 2 } };
const obj2 = { a: 1, b: { c: 2 } };

console.log(_.isEqual(obj1, obj2)); // true

function deepEqual(obj1, obj2, seen = new Set()) {
  if (obj1 === obj2) return true;
  if (typeof obj1 !== 'object' || typeof obj2 !== 'object') return false;

  const obj1Keys = Object.keys(obj1);
  const obj2Keys = Object.keys(obj2);

  if (obj1Keys.length !== obj2Keys.length) return false;

  for (const key of obj1Keys) {
    if (!seen.has(obj1)) {
      seen.add(obj1);
      if (!deepEqual(obj1[key], obj2[key], seen)) return false;
    }
  }

  return true;
}

const _ = require('lodash');

const obj1 = { a: 1 };
obj1.b = obj1;

const obj2 = { a: 1 };
obj2.b = obj2;

console.log(_.isEqual(obj1, obj2)); // true