node.js

问题 I want to write unit test for my react app. The first unit test I wrote is as follow it('renders without crashing', () => { const div = document.getElementById('root'); ReactDOM.render(<Index />, div); }); However I got the error Invariant Violation: _registerComponent(...): Target container is not a DOM element. I have to say that the application I wrote actually has no such error, if I run it with npm start This error only exists when I test my program with unit test. I'm wondering how to

问题 I'm trying to add a tag to my AWS Spot Request. But it has returned me { UnexpectedParameter: Unexpected key 'TagSpecifications' found in params.LaunchSpecification . I have followed this documentation, and I have already tried to move this code out of LaunchSpecification, but the error persists. const params = { InstanceCount: 1, LaunchSpecification: { ImageId: config.aws.instanceAMI, KeyName: 'backoffice', InstanceType: config.aws.instanceType, SecurityGroupIds: [config.aws

问题 I just started using Jest. For debugging under testcase file; describe("Filter function", () => { test("it should filter by a search", () => { const input = [ { id: 1, url: "https://www.google.com" }, { id: 2, url: "https://www.yahoo.com" }, { id: 3, url: "https://www.gmail.com" } ]; const output = [{ id: 3, url: "https://www.gmail.com" }]; debugger; expect(filterByTerm(input, "gmail")).toEqual(output); debugger; expect(filterByTerm(input, "GMAIL")).toEqual(output); }); }); under Project

问题 I'm trying to add a tag to my AWS Spot Request. But it has returned me { UnexpectedParameter: Unexpected key 'TagSpecifications' found in params.LaunchSpecification . I have followed this documentation, and I have already tried to move this code out of LaunchSpecification, but the error persists. const params = { InstanceCount: 1, LaunchSpecification: { ImageId: config.aws.instanceAMI, KeyName: 'backoffice', InstanceType: config.aws.instanceType, SecurityGroupIds: [config.aws

问题 Is it possible to run a Node.js file from the serverside from JavaScript? If so how would i? I have googled some but cant find a real answer to this. Thanks 回答1: NodeJS is JavaScript on the server-side environment. What you refer as "JavaScript" is actually the same JavaScript, just in your browser environment. What you can do: you can use Webpack to create a NodeJS app, that will automatically create an index.html and put it on a server. With webpack, you can also import NodeJS modules in

问题 Is it possible to run a Node.js file from the serverside from JavaScript? If so how would i? I have googled some but cant find a real answer to this. Thanks 回答1: NodeJS is JavaScript on the server-side environment. What you refer as "JavaScript" is actually the same JavaScript, just in your browser environment. What you can do: you can use Webpack to create a NodeJS app, that will automatically create an index.html and put it on a server. With webpack, you can also import NodeJS modules in

问题 Mongoose updateMany with different values by unique id like email Old BD Data: usersCollection = [ { _id: 1, email: "one@gmail.com", name: "one" }, { _id: 2, email: "two@gmail.com", name: "two" }, { _id: 3, email: "three@gmail.com", name: "three" } ]; Coming Data: users = [ { email: "one@gmail.com", name: "oneeee" }, { email: "two@gmail.com", name: "twoooo" }, { email: "three@gmail.com", name: "three" }, { email: "three@gmail.com", name: "four" } ]; What I'm expecting to to have after insert

问题 I did find a few people with a slightly different setup but with the same issue. So I hope this doesn't feel like a duplicated question. My setup is pretty simple and straight-forward. I have a container for my node app and a container for my Postgres database. When I run docker-compose up and I see the log both containers are up and running. The problem is my node app is not connecting to the database. I can connect to the database using Postbird and it works as it should. If I create a

问题 I am making react project using express.js, mongodb, react.js, and node.js. and trying to fetch data from backend api which is running on port 5000. When I check the api using postman , it is working. And the data is showing in the browser's console. Also, when I press Get button as given in the code below, it doesn't work on the browser. But I'm able to see the array data in the browser's console. <Button onClick={()=><li>{employeeItem}</li>}>Get</Button> Here is my full code: import React,

问题 This going to be my first node deployment. I have this app which runs fine on my Debian 9 server using this command: cd /srv/myapp && NODE_ENV=production yarn start And print out this message: yarn run v1.6.0 $ babel-node index.js In order to demonize the app using systemd, I created `/lib/systemd/system/myapp.service: [Unit] Description=Myapp [Service] ExecStart=/home/john/start.sh Type=simple User=john Restart=on-failure [Install] WantedBy=multi-user.target and in start.sh I have: cd /srv