js清除全部cookie

试了很多网上写的清除cookie的代码，逻辑是将cookie有效期设为过期时间，但是没有效果，最后发现还要再加个max-age=0

const clearCookie = () => {
  var keys = document.cookie.match(/[^ =;]+(?==)/g);
  if (keys) {
    for (var i = keys.length; i--; ) {
      document.cookie =
        keys[i] +
        "=0;expires=" +
        new Date(0).toUTCString() +
        ";max-age=0";
    }
  }
};