npm cannot install vue globally

In recent years, Vue.js has been recognized by the majority of developers as an excellent front-end development framework and has received more and more attention and use. However, when using npm to install Vue.js globally, sometimes you will encounter a situation where it cannot be installed. The following will be discussed and analyzed from the following aspects.

1. How npm works

npm stands for node package manager and is the default tool for managing and sharing code packages on the node.js platform. It is both a command line tool and a rich collection of resources generated by the Node.js community and third-party developers. npm originated from the open source community. The node.js platform community has different npm image sources, such as Taobao image, cnpmjs image, etc.

npm manages the node.js module, and compared to the global environment, it is obviously a local management tool, so npm needs to be used in the project to install and manage dependent libraries.

2. Problems encountered when npm installs Vue.js globally

When using npm to globally install Vue.js, you may encounter the following error message:

1. npm ERR! code EACCES
   npm ERR! syscall mkdir
   npm ERR! path /usr/local/lib/node_modules
   npm ERR! errno -13
   npm ERR! Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules'
   npm ERR! { [Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules']
   npm ERR! stack:
   npm ERR! 'Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules'',
2. npm ERR! code EINTEGRITY
   npm ERR! sha512-htmrTQx6GyJ5dIhRRrZ4WGGT /XaXxvJJhn5Qk9xxapFZMs ySprWof2EN4yjy kQNP AHd /ZfJjHS8G4w== integrity checksum failed when using sha512: wanted sha512-htmrTQx6GyJ5dIhRRrZ4WGGT /XaXxvJJhn5Qk9xxapFZMs ySprWof2EN4yjy kQNPAEdKfpT/ZfJjHS8G4w== but got sha512-lad4xKf5/MIoKJm MJCAEvVr66/j6/MwXvODhRxj2VVbITLh9XsOnKf4UyjpEyuU8HhUhAt7lQf3vhHO5Iqavbg==. (1819 bytes)

These two error messages may mean the following situations:

1. Insufficient permissions prevent Vue.js from being installed globally, and you need to install it with administrator permissions.
2. There is a problem with the download source or mirror source, which may need to be replaced.
3. Check whether the node.js version is too low and whether the current Vue.js version is supported.
4. For local cache problems, use npm cache clean to clear the cache and then try to install it.

3. How to solve the problem that npm cannot install Vue.js globally

1. Install with administrator rights.

In the command line window, use sudo or run the command line tool with administrator privileges, and change the global installation instructions to:

sudo npm install -g vue-cli

2. Change the npm source or mirror source

Use Taobao mirror or cnpmjs mirror to install Vue.js:

npm install -g cnpm --registry=https://registry.npm.taobao.org

cnpm install -g vue-cli

3. Check the node.js version and Vue.js version

Check whether the current node.js version is compatible with the Vue.js version by querying the Vue.js official documentation or checking the Vue.js version number through npm. If the versions are incompatible, npm will cause some unexpected errors.

4. Clear npm local cache

Use the npm cache clean command to clear the local cache and try to install Vue.js globally again.

Summary:

When using npm to globally install Vue.js, you need to pay attention to permissions, source selection, version issues, and methods such as clearing the local cache. Only by correctly troubleshooting and solving problems can we ensure a smooth global installation of Vue.js.

Developers should try their best to choose the most suitable installation method and tool chain based on the current environment and situation, and make the best decision. In daily exercises and projects, we should master and apply these knowledge points in order to carry out front-end development work more smoothly.

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