现在是凌晨 2.47 - 想通了.

So it is 2.47am - figured it out.

尽管 node-gyp 站点似乎建议使用 Visual Studio 2010 或 2012，但对于 Windows 8.1，请安装 适用于 Windows 桌面的 Visual Studio Express 2013，如这个问题.

Although the node-gyp site seems to suggest using Visual Studio 2010 or 2012, instead for Windows 8.1, install Visual Studio Express 2013 for Windows Desktop as discussed in this issue.