mac下安装cnpm淘宝镜像

cnpm：官网html (事先已经安装了node，有npm)查看官网，提示安装需运行命令：npm install -g cnpm --registry=https://registry.npm.taobao.orgnode mac上运行 后发现错误：npm npm WARN checkPermissions Missing write access to /usr/local/lib/node_m

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