HTTP_PROXY

Linux, macOS, or Unix:

$ export HTTP_PROXY=http://a.b.c.d:n
$ export HTTPS_PROXY=http://w.x.y.z:m

设置：export 变量名=变量值
删除：unset 变量名

Windows:

> set HTTP_PROXY=http://a.b.c.d:n
> set HTTPS_PROXY=http://w.x.y.z:m

E:\a>npm install images

> images@3.0.1 install E:\a\node_modules\images
> node ./scripts/install.js

Downloading binary from https://github.com/zhangyuanwei/node-images/releases/download/v3.0.1/win32-
64-57_binding.node
Cannot download "https://github.com/zhangyuanwei/node-images/releases/download/v3.0.1/win32-x64-57_
inding.node":

tunneling socket could not be established, statusCode=504

Hint: If github.com is not accessible in your location
      try setting a proxy via HTTP_PROXY, e.g.

      export HTTP_PROXY=http://example.com:1234

or configure npm proxy via

      npm config set proxy http://example.com:8080
npm WARN saveError ENOENT: no such file or directory, open 'E:\a\package.json'
npm WARN enoent ENOENT: no such file or directory, open 'E:\a\package.json'
npm WARN a No description
npm WARN a No repository field.
npm WARN a No README data
npm WARN a No license field.

+ images@3.0.1
updated 1 package in 13.491s

一定是代理的问题，请将 npm config set proxy 设置成正确的地址和端口。