.catch () dalam janji akan juga mengembalikan janji
// Throwing an error will call the catch method most of the time
var p1 = new Promise(function(resolve, reject) {
throw new Error('Uh-oh!');
});
p1.catch(function(e) {
console.error(e); // "Uh-oh!"
});
// Errors thrown inside asynchronous functions will act like uncaught errors
var p2 = new Promise(function(resolve, reject) {
setTimeout(function() {
throw new Error('Uncaught Exception!');
}, 1000);
});
p2.catch(function(e) {
console.error(e); // This is never called
});
// Errors thrown after resolve is called will be silenced
var p3 = new Promise(function(resolve, reject) {
resolve();
throw new Error('Silenced Exception!');
});
p3.catch(function(e) {
console.error(e); // This is never called
});
Gifted Gecko