判断一个对象是否是isPlainObject

[Sunny-117]

function isPlainObject(obj) {
  if (typeof obj !== "object") {
    return false;
  }
  return Object.getPrototypeOf(obj) === Object.prototype;
}

[kangkang123269]

function isPlainObject(obj) {
  if (typeof obj !== 'object' || obj === null) {
    return false;
  }

  const proto = Object.getPrototypeOf(obj);
  if (proto === null) {
    return true;
  }

  let baseProto = proto;
  while (Object.getPrototypeOf(baseProto) !== null) {
    baseProto = Object.getPrototypeOf(baseProto);
  }

  return proto === baseProto;
}

[huxuedong]

//vue中的判断方法
var _toString = Object.prototype.toString;
function isPlainObject(obj) {
return _toString.call(obj) === '[object Object]';
}