Firebase 错误：无法读取未定义的属性（读取“pieceNum_”）

Question

错误：

我不知道问题是什么，为什么我会收到此错误？

function downloa2323d() {
    console.log("Trying to download")
    get(child(database, `design-tournament/`)).then((snapshot) => {
        if (snapshot.exists()) {
          let jsonData = snapshot.val();
          function download(content, fileName, contentType) {
            const a = document.createElement("a");
            const file = new Blob([content], { type: "application/json" });
            a.href = URL.createObjectURL(file);
            a.download = fileName;
            a.click();
          }
  
          function onDownload(){
            console.log(jsonData)
              download(jsonData, "design-tournament-game.json", "text/plain");
          }

          onDownload()
        } else {
          console.log("No data available");
        }
      }).catch((error) => {
        console.error(error);
      });
}

document.getElementById("exportGame").addEventListener('click', downloa2323d )

错误行：745是代码中从firebase获取子数据库

import { getDatabase, ref, child, get, push, update, onValue } from "https://www.gstatic.com/firebasejs/10.0.0/firebase-database.js";

const app2 = initializeApp(firebaseConfig2, "server");
const database = getDatabase(app2);

Answer 1

我修好了！我忘了添加 ref()。阅读文档后我注意到了

也许如果您遇到此问题，请尝试添加 ref( 数据库 ) 而不仅仅是数据库