Cómo verificar si la propiedad existe en un objeto en el script Java
if (obj.hasOwnProperty('prop')) {
// do something
}
Expensive Eland
if (obj.hasOwnProperty('prop')) {
// do something
}const object1 = new Object();
object1.property1 = 42;
console.log(object1.hasOwnProperty('property1'));
// expected output: trueconst hero = {
name: 'Batman'
};
hero.hasOwnProperty('name'); // => true
hero.hasOwnProperty('realName'); // => falsevar person = {'first_name': 'bill','age':20};
if ( person.hasOwnProperty('first_name') ) {
//person has a first_name property
}
hero.hasOwnProperty('name'); // => true