如何在JavaScript中定义对象的比较方式

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

console.log(obj1 == obj2); // false
console.log(obj1 === obj2); // false

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

console.log(JSON.stringify(obj1) == JSON.stringify(obj2)); // true
console.log(JSON.stringify(obj1) === JSON.stringify(obj2)); // true

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

const keys1 = Object.keys(obj1);
const keys2 = Object.keys(obj2);

if (keys1.length !== keys2.length) {
  console.log('对象不相等');
} else {
  let isEqual = true;
  for (let i = 0; i< keys1.length; i++) {
    const key = keys1[i];
    if (!obj2.hasOwnProperty(key) || obj1[key] !== obj2[key]) {
      isEqual = false;
      break;
    }
  }
  console.log(isEqual); // true
}

function isEqual(obj1, obj2) {
  if (obj1 === obj2) {
    return true;
  }

  if (typeof obj1 !== 'object' || obj1 === null || typeof obj2 !== 'object' || obj2 === null) {
    return false;
  }

  const keys1 = Object.keys(obj1);
  const keys2 = Object.keys(obj2);

  if (keys1.length !== keys2.length) {
    return false;
  }

  for (let i = 0; i< keys1.length; i++) {
    const key = keys1[i];
    if (!obj2.hasOwnProperty(key) || !isEqual(obj1[key], obj2[key])) {
      return false;
    }
  }

  return true;
}

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

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