config.js在head数组中添加类似的内容。请注意，这会添加firebase-app（核心）、firebase-auth、firestore和 ，cloud functions因为我在我的项目中使用了 4 个模块。

请注意，我还初始化都firebase和firestore这里。因此，我将firestore作为全局变量。

当 firebase 加载时，所有这些都将被提升到应用程序的头部部分。

 head: [

    [
      "script",
      {
        src: "https://www.gstatic.com/firebasejs/5.5.6/firebase-app.js"
      }
    ],

    [
      "script",
      {
        src: "https://www.gstatic.com/firebasejs/5.5.6/firebase-auth.js"
      }
    ],

    [
      "script",
      {
        src: "https://www.gstatic.com/firebasejs/5.5.6/firebase-firestore.js"
      }
    ],

    [
      "script",
      {
        src: "https://www.gstatic.com/firebasejs/5.5.6/firebase-functions.js"
      }
    ],

    [
      "script",
      {},
      `var config = {
        apiKey: "apikey",
        authDomain: "app.firebaseapp.com",
        databaseURL: "https://app.firebaseio.com",
        projectId: "appname",
        storageBucket: "appname.appspot.com",
        messagingSenderId: "12345"
      };
      firebase.initializeApp(config);
      const firestore = firebase.firestore();
      const settings = { /* your settings... */
          timestampsInSnapshots: true
      };
      firestore.settings(settings);`
    ],
    ]