为什么每次创建一个新的angular 2项目时都必须运行npm install？

Question

每次我创建一个新的angular 2项目时，它说“node_modules显示为空，你可能需要运行`npm install”

Answer 1

Dependencies

In your angular project, you have a file called package.json . this file is responsible for holding track of your projects dependencies .

When you run npm install , Node Package Manager , or npm for short, will download those dependencies and put them in node_modules folder.

Answer 2

You need to run npm install to install the dependencies. May be refer to https://docs.npmjs.com/cli/install .

Answer 3

Consider using the Angular CLI to build your application instead. Then you won't need to use npm install when building a new application.

See this for more information: https://github.com/angular/angular-cli/wiki

Answer 4

Once you run the ng new my-project . Just give it some time to install the dependencies into the node_modules folder, which shows the below message.

Installing packages for tooling via npm

You will get the following message once it is done:

Installed packages for tooling via npm. Project 'my-project' successfully created.

Now try running the ng serve . It should work fine.