npm安装：idealTree:npm: sill idealTree buildDeps

原因一：是因为node的默认安装环境在国外，需要修改镜像地址。

采用taobao的镜像地址，进入cmd之后输入：npm config set registry https://registry.npm.taobao.org

如果依然慢，需将npm源切换到新的：registry.npmmirror.com

npm的命令

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

yarn的命令

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

查看是否安装成功

npm config get registry