在Javascript中,为什么[1,2] == [1,2]或({a:1})==({a:1})为假？

function arraysEqual(a, b) {
  if (a.length !== b.length) return false;
  for (let i = 0; i < a.length; i++) {
    if (a[i] !== b[i]) return false;
  }
  return true;
}

function objectsEqual(a, b) {
  const aKeys = Object.keys(a);
  const bKeys = Object.keys(b);
  if (aKeys.length !== bKeys.length) return false;
  for (const key of aKeys) {
    if (!b.hasOwnProperty(key) || a[key] !== b[key]) return false;
  }
  return true;
}