把composer的源切换为国际源国内源
把composer的源切换为 国际的源：
composer config -g repo.packagist composer https://packagist.org
国际源切换为中国镜像：
composer config -g repo.packagist composer https://packagist.phpcomposer.com
把composer的源切换为 国际的源：
composer config -g repo.packagist composer https://packagist.org
国际源切换为中国镜像：
composer config -g repo.packagist composer https://packagist.phpcomposer.com
把composer的源切换为国际源国内源：等您坐沙发呢！