如何访问firebase集合

var db = firebase.firestore();
var collectionRef = db.collection('your_collection_name');

collectionRef.add({
  field1: value1,
  field2: value2,
  // ...
})
.then(function(docRef) {
  console.log("Document written with ID: ", docRef.id);
})
.catch(function(error) {
  console.error("Error adding document: ", error);
});

collectionRef.get()
.then(function(querySnapshot) {
  querySnapshot.forEach(function(doc) {
    console.log(doc.id, " => ", doc.data());
  });
})
.catch(function(error) {
  console.error("Error getting documents: ", error);
});

var docRef = collectionRef.doc('your_document_id');

docRef.update({
  field1: newValue1,
  field2: newValue2,
  // ...
})
.then(function() {
  console.log("Document successfully updated!");
})
.catch(function(error) {
  console.error("Error updating document: ", error);
});

var docRef = collectionRef.doc('your_document_id');

docRef.delete()
.then(function() {
  console.log("Document successfully deleted!");
})
.catch(function(error) {
  console.error("Error deleting document: ", error);
});