Excuting an order
yarn add node-sass@4.7.2 --dev --registry=https://registry.npm.taobao.org
: Error
This problem occurs because the network is usually the problem is the wall, and this time we may wish to try another source
config SET Registry yarn 
https://registry.npm.taobao.org/ yarn download source provided by the command
Finally, execute the following command to install success
pm and node-sass @ 4.7 . 2 -D --registry = https: // registry.npm.taobao.org