1.通过config命令
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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
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npm --registry https://registry.npm.taobao.org info underscore
#3.编辑 ~/.npmrc 加入下面内容
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registry = https://registry.npm.taobao.org