Npm usage error

  node.js, question
npm ERR!  fetch failed https://registry.npmjs.org/find-index/-/find-index-0.1.1.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed https://registry.npmjs.org/indent-string/-/indent-string-2.1.0.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed  https://registry.npmjs.org/find-up/-/find-up-1.1.2.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed  https://registry.npmjs.org/read-pkg/-/read-pkg-1.1.0.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed https://registry.npmjs.org/signal-exit/-/signal-exit-2.1.2.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.1.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed  https://registry.npmjs.org/globule/-/globule-0.1.0.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.1.4.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT
 
 npm ERR!  fetch failed  https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz
 
 npm WARN retry will retry, error on last attempt: Error: connect ETIMEDOUT

Try matching with Taobao image:

npm config set registry  https://registry.npm.taobao.org

Then repeat the command you just made a mistake and try again.