1. Change into a directory in your path like cd /usr/local/bin

2. Get Composer curl -sS https://getcomposer.org/installer | php

3. Make the phar executable chmod a+x composer.phar

4. Change into a project directory cd /path/to/my/project

5. Use Composer as you normally would composer.phar install

6. Optionally you can rename the composer.phar to composer to make it easier

　　if storage permission denied

　　You can input command that

　　1、find storage -type d -exec chmod 777 {} \;

　　2、find storage -type f -exec chmod 777 {} \;