NodeJs npm install package management tool, commonly used commands

NodeJs npm install package management tool, commonly used commands

package.json some entry

dependencies

Refers to the productionpackage needs to ambient

// 添加到您package.json的 dependencies：

`npm install <package_name> --save`
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devDependencies

Only developmentand the testingenvironment when required installation package

// 添加到您package.json的 devDependencies：

`npm install <package_name> --save-dev`
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optionalDependencies

If some packagecan not be installed, but you still want to continue npm install, you can put these uncertain whether that can be installed packageinto this below

But to ensure that the program still have to install thesepackage

try {
  var foo = require('foo')
  var fooVersion = require('foo/package.json').version
} catch (er) {
  foo = null
}
if ( notGoodFooVersion(fooVersion) ) {
  foo = null
}

// .. then later in your program ..

if (foo) {
  foo.doFooThings()
}
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Note: The optionalDependenciesconfiguration will be covered devDependencies, usually the best option is to write in one place

---

npm install

Any package will install the package and its dependencies

npm install (无参数)

All modules will be installed as dependencies package.json

-D, --save-dev

Installation package will appear in devDependencies

-O, --save-optional

Installation package will appear in optionalDependencies

--no-save

Save to prevent dependencies

-P, --save-prod

Installation package will appear dependencies, this is the default, unless -Dor-O

-g, --global

The global installation package installed

asl run

From package.jsonthe scriptsobject to run arbitrary commands

// vue cli3 中的 package.json
// 执行 npm run serve
// 实际上是 npm run node_modules/.bin/vue-cli-service serve
"scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
}
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Reproduced in: https: //juejin.im/post/5cfe05d56fb9a07ee9586494