anchor.diff:  #  PS：还可以挂载到宿主机类库到指定目录下执行dotnet restore --packages <PACKAGES_DIRECTORY>
   #                          
   ##### ##### ##### ##### ##### ##### ##### ##### ##### #####
  +RUN echo " Install .Net Core SDK  " \
   
  -&& echo " Install .Net Core SDK  " \
  +&& cd "${DOTNET_SETUP_DIR}/" \
   && DOTNET_SDK_DOWNLOAD_URL="https://dotnetcli.blob.core.windows.net/dotnet/Sdk/$DOTNET_SDK_VERSION/dotnet-dev-debian-x64.$DOTNET_SDK_VERSION.tar.gz" \
  -&& wget -cq ${DOTNET_SDK_DOWNLOAD_URL} -O "${DOTNET_SETUP_DIR}/dotnet.tar.gz" 
  +&& wget -cq ${DOTNET_SDK_DOWNLOAD_URL} -O "${DOTNET_SETUP_DIR}/dotnet.tar.gz" \
   && mkdir -p /usr/share/dotnet \
   && tar -zxf "${DOTNET_SETUP_DIR}/dotnet.tar.gz" -C /usr/share/dotnet \
   && ln -sf /usr/share/dotnet/dotnet /usr/bin/dotnet \
  
positive.code:     DOTNET_SETUP_DIR=/usr/src/dotnet-build \
      BUILD_CHINA=false
      
  ARG NPM_DEFAULT_PACKAGE=gulp-cli grunt-cli bower markdown-styles yarn gulp
  
  COPY setup/ ${DOTNET_SETUP_DIR}/
  
  RUN chmod +x ${DOTNET_SETUP_DIR}/china.sh && ${DOTNET_SETUP_DIR}/china.sh
  
negative.code: #                       
  ##### ##### ##### ##### ##### ##### ##### ##### ##### #####
  RUN echo "  Install Front Building Support " \
  && NPM_DEFAULT_PACKAGE="gulp-cli grunt-cli bower markdown-styles yarn gulp" \
  
  # gpg keys listed at https://github.com/nodejs/node#release-team
  && gpg --keyserver pool.sks-keyservers.net --recv-keys 94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
  