when npm install, first of all, the Times mistakenly exceeded the maximum memory. It probably means that when I reinstall version 4.6.1 of npm, and re-install, I always stay in the place of fetchMetadata: sill mapToRegistry xxxxurl. After three hours, there is no success in Install. The answer on the Internet is to switch to Taobao image address. My npm source has always been Taobao image address. How to solve this problem?