解决了！
在 index.html中 添加最新版本的Firebase存储：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title></title> <script src="https://www.gstatic.com/firebasejs/6.3.1/firebase-app.js"></script> <script src="https://www.gstatic.com/firebasejs/6.3.1/firebase-firestore.js"></script> <script src="https://www.gstatic.com/firebasejs/6.3.1/firebase-auth.js"></script> <script src="https://www.gstatic.com/firebasejs/6.3.1/firebase-storage.js"></script> <script defer src="main.dart.js" type="application/javascript"></script></head><body></body></html>
在 yourClass.dart中 ：
import 'package:firebase/firebase.dart' as fb; fb.StorageReference _ref = fb.storage().ref('images');
