使用selenium时需要先安装chrome和chromedriver，以下是在Docker中安装的步骤
apt-get -y install xvfb gtk2-engines-pixbuf
apt-get -y install xfonts-cyrillic xfonts-100dpi xfonts-75dpi xfonts-base xfonts-scalable
apt-get -y install imagemagick x11-apps
Xvfb -ac :99 -screen 0 1280x1024x16 & export disPLAY=:99
wget -q -O - http://dl.google.com/linux/linux_signing_key.pub | apt-key add -
sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
apt-get update -y
apt-get -y install google-chrome-stable
wget http://chromedriver.storage.googleapis.com/2.38/chromedriver_linux64.zip
apt-get -y install zip
apt-get -y install unzip
unzip chromedriver_linux64.zip
cp chromedriver /usr/bin/
