1.通过config命令 npm config set registry https://registry.npm.taobao.org npm info underscore (如果上面配置正确这个命令会有字符串response)
2.命令行指定 npm --registry https://registry.npm.taobao.org info underscore
3.编辑 ~/.npmrc 加入下面内容 registry = https://registry.npm.taobao.org
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