conda、pip、npm、yarn换国内源

conda源

# conda源
conda config --add channels https://mirrors.ustc.edu.cn/anaconda/pkgs/main/
conda config --set show_channel_urls yes# 换回conda的默认源
conda config --remove-key channels

pip源

# pip源# 永久换源
pip config set global.index-url https://mirrors.aliyun.com/pypi/simple/# 临时换源安装matplotlib
pip install -i https://mirrors.aliyun.com/pypi/simple/ matplotlib 

npm源

npm config set registry https://registry.npmmirror.com

yarn源

yarn config set registry https://registry.npmmirror.com