npm安装依赖报错npm ERR! code ENOTFOUND npm ERR! errno ENOTFOUND

npm安装依赖报错
今天在学习webpack的时候,在使用npm install来安装一个局部的webpack时候,报出一下错误:

npm ERR! code ENOTFOUND
npm ERR! errno ENOTFOUND
npm ERR! network request to http://registry.cnpmjs.org/webpack failed, reason: getaddrinfo ENOTFOUND proxy-szn
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network 
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'

当时以为是npm的配置出问题了,因为npm太久没使用,而且之前小编好像把npm的一些东西给删除了,但是后来经过查询百度都说npm在国内访问慢的原因,后面换成淘宝镜像cnpm之后就好了。
解决方法:

1、执行:
npm config get proxy
npm config get https-proxy
如果返回值不为null,继续执行:
(要确保两个返回值都是null才可以,否则就要执行下面的代码)
npm config set proxy null
npm config set https-proxy null
2、执行:
npm config set registry http://registry.cnpmjs.org/

然后执行下面的代码就可以安装cnpm了

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

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