Javascript 在reactjs中使用Firebase数据库时出现Firebase JS SDK警告
我正在尝试将firebase数据库用于我的项目,但无法正确导入和使用该模块。我遵循了官方文件的建议 这就是我使用它的代码Javascript 在reactjs中使用Firebase数据库时出现Firebase JS SDK警告,javascript,reactjs,firebase,firebase-realtime-database,react-router,Javascript,Reactjs,Firebase,Firebase Realtime Database,React Router,我正在尝试将firebase数据库用于我的项目,但无法正确导入和使用该模块。我遵循了官方文件的建议 这就是我使用它的代码 import React from "react"; import firebase from "firebase"; import ProjectItemCards from "./components/project-item-cards"; const ProjectContext = React.creat
import React from "react";
import firebase from "firebase";
import ProjectItemCards from "./components/project-item-cards";
const ProjectContext = React.createContext();
class ProjectProvider extends React.Component {
constructor() {
super();
this.state = {
social: {},
projects: [],
featuredProjects: [],
loading: true,
};
}
componentDidMount() {
var ref = firebase.database().ref("projects");
ref.on("value", (snapshot) => {
const projects = snapshot.val();
console.log(projects);
const featuredProjects = projects
.map((project) => (project.featured === true ? project : null))
.slice(0, 4);
this.setState({
projects,
featuredProjects,
loading: false,
});
});
}
getProjectElements(projects) {
const projectElementList = projects.map((project, index) => {
return (
<ProjectItemCards key={index} project={project}></ProjectItemCards>
);
});
return projectElementList;
}
render() {
return (
<ProjectContext.Provider
value={{ ...this.state, getProjectElements: this.getProjectElements }}
>
{this.props.children}
</ProjectContext.Provider>
);
}
}
export { ProjectProvider, ProjectContext };
从“React”导入React;
从“firebase”导入firebase;
从“/components/project item cards”导入ProjectItemCards;
const ProjectContext=React.createContext();
类ProjectProvider扩展了React.Component{
构造函数(){
超级();
此.state={
社会:{},
项目:[],
特色项目:[],
加载:对,
};
}
componentDidMount(){
var ref=firebase.database().ref(“项目”);
参考on(“值”,(快照)=>{
const projects=snapshot.val();
console.log(项目);
const featuredProjects=项目
.map((project)=>(project.featured==true?project:null))
.切片(0,4);
这是我的国家({
项目,
特色项目,
加载:false,
});
});
}
getProjectElements(项目){
const projectElementList=projects.map((项目,索引)=>{
返回(
);
});
返回项目元素列表;
}
render(){
返回(
{this.props.children}
);
}
}
导出{ProjectProvider,ProjectContext};
我已初始化firebase,如下所示
import React from "react";
import ReactDOM from "react-dom";
import App from "./App";
import "bootstrap";
import "./sass/main.scss";
import * as firebase from "firebase/app";
import "firebase/analytics";
var firebaseConfig = {
apiKey: process.env.REACT_APP_API_KEY,
authDomain: "",
databaseURL: "",
projectId: "",
storageBucket: "",
messagingSenderId: "",
appId: "1:841600272388:web:12314d1260dded0601cd51",
measurementId: "G-55E4QT6C4F",
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
firebase.analytics();
ReactDOM.render(<App />, document.getElementById("root"));
从“React”导入React;
从“react dom”导入react dom;
从“/App”导入应用程序;
导入“引导”;
导入“/sass/main.scss”;
从“firebase/app”导入*作为firebase;
导入“firebase/analytics”;
var firebaseConfig={
apiKey:process.env.REACT\u APP\u API\u KEY,
authDomain:“”,
数据库URL:“”,
投射:“,
storageBucket:“”,
messagingSenderId:“”,
appId:“1:841600272388:web:12314d1260dded0601cd51”,
测量:“G-55E4QT6C4F”,
};
//初始化Firebase
firebase.initializeApp(firebaseConfig);
firebase.analytics();
ReactDOM.render(初始化代码应在实用程序文件中使用,如下所示:
import * as firebase from 'firebase/app'
import 'firebase/firestore'
import 'firebase/storage'
const firebaseConfig = {
apiKey: process.env.REACT_APP_FIREBASE_API_KEY,
authDomain: process.env.REACT_APP_FIREBASE_AUTH_DOMAIN,
databaseURL: process.env.REACT_APP_FIREBASE_DATABASE_URL,
projectId: process.env.REACT_APP_FIREBASE_PROJECT_ID,
storageBucket: process.env.REACT_APP_FIREBASE_STORAGE_BUCKET,
messagingSenderId: process.env.REACT_APP_FIREBASE_MESSAGING_SENDER_ID,
appId: process.env.REACT_APP_FIREBASE_APP_ID
}
firebase.initializeApp(firebaseConfig)
export const db = firebase.firestore()
export const storage = firebase.storage()
export default firebase
您希望导出您正在使用的单个firebase功能。在您的情况下,我假设firebase.firestore
那么您的导入应该如下所示:
import {db} from '../utils/firebase'
我相信这会扼杀警告!我建议,因为这已经出现过几次了。