var myObject = {

    name: '@tips_js'

};

​

console.log(myObject.hasOwnProperty('name')); // true

console.log('name' in myObject); // true

​

console.log(myObject.hasOwnProperty('valueOf')); // false, valueOf is inherited from the prototype chain

console.log(('valueOf' in myObject)); // true

​

// Anohter example

var myFunc = function() {

  this.name = '@tips_js';

};

myFunc.prototype.age = '10 days';

​

var user = new myFunc();

​

console.log(user.hasOwnProperty('name')); // true

console.log(user.hasOwnProperty('age')); // false, because age is from the prototype chain