问相当于"Child_Added“的Firestore实时监听器

EN

exports.createUser = functions.firestore
.document('users/{userId}')
.onCreate((snap, context) => {
  // Get an object representing the document
  // e.g. {'name': 'Marie', 'age': 66}
  const newValue = snap.data();

  // access a particular field as you would any JS property
  const name = newValue.name;

  // perform desired operations ...
});