tunneling socket could not be established, cause=connect ECONNREFUSED 127.0.0.1:56281
npm ERR! network This is most likely not a problem with npm itself
npm ERR! network and is related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
错误原因：我开了代理。
解决方案：npm config set proxy null
转载于:https://www.cnblogs.com/gdouzz/p/6912806.html