NPM-CNPM-安装失败

报错：
NPM Unexpected end of JSON input while parsing near
npm ERR! A complete log of this run can be found in:

解决方案：
npm install --registry=https://registry.npm.taobao.org --loglevel=silly
npm cache clean --force

然后再正常安装
sudo npm install -g cnpm --registry=https://registry.npm.taobao.org