Bucket の購読確認

// Instantiate the target bucket.
var user = KiiUser.getCurrentUser();
var bucket = user.bucketWithName("_target_bucket_");

// Check if the current user is subscribed to the bucket.
user.pushSubscription().isSubscribed(bucket).then(
  function(params) {
    var thePushSubscription = params[0];
    var theBucket = params[1];
    var isSubscribed = params[2];
    if(isSubscribed) {
      // The current user is subscribed to the bucket.
    } else {
      // The current user is not subscribed to the bucket.
    }
  }
).catch(
  function(error) {
    // Handle the error.
    var thePushSubscription = error.target;
    var errorString = error.message;
  }
);