如何在firebase实时数据库中实现两级数据插入

<script src="https://www.gstatic.com/firebasejs/9.0.2/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/9.0.2/firebase-database.js"></script>
<script>
  // 初始化Firebase SDK
  const firebaseConfig = {
    apiKey: "YOUR_API_KEY",
    authDomain: "YOUR_AUTH_DOMAIN",
    projectId: "YOUR_PROJECT_ID",
    storageBucket: "YOUR_STORAGE_BUCKET",
    messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
    appId: "YOUR_APP_ID"
  };
  firebase.initializeApp(firebaseConfig);
</script>

const database = firebase.database();
const dataRef = database.ref("path/to/data");

// 使用push()方法插入数据
dataRef.push({
  key1: value1,
  key2: value2
});

const database = firebase.database();
const dataRef = database.ref("path/to/data");

// 使用set()方法插入数据
dataRef.set({
  key1: value1,
  key2: value2
});

const database = firebase.database();
const dataRef = database.ref("path/level1/level2");

// 使用push()方法插入数据
dataRef.push({
  key1: value1,
  key2: value2
});