未来类型产品(字符串currentUser)异步{等待databaseReference.collection('products')。getDocuments()。then(((QuerySnapshot snapShot){_type = snapShot.dococments;_type.forEach((数据){print(data.documentID);在此处输入图片描述});});}
final productsRef = Firestore.instance.collection(products);
productsRef.getDocuments().then(( QuerySnapshot snapshot){
snapshot.documents.forEach((DocumentSnapshot doc){
print(doc.data);
});
});