安装nodejs 无论打什么命令都是提示Usage: npm

逛了一圈网上，根据他们写的教程走了一遍，安装下来会发现，npm -v都会提示node Usage: npm <command> where <command> is one of: access, adduser, audit, bin, bugs, c, cache, ci, cit, completion, config, create, ddp, dedupe, depre

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