// Base class
function Alert (title) {
if (!(this instanceof Alert)) {
return new Alert();
}
this.title = title || 'alert';
}
// Base class method show
Alert.prototype.show = function () {
console.log(this.title);
};
// class extends Base class
function SuccessAlert(title) {
Alert.call(this, title);
this.type = 'success';
}
// class methods of extending Base class
SuccessAlert.prototype = Alert.prototype;
SuccessAlert.prototype.on = function () {
console.log('getting on');
};
const message = new SuccessAlert('success');
message.show();
message.on();
