PHP composer 报错

composer依赖包安装中出现这个错误：

guo@guoiMac yoshop2.0 % composer install 
No lock file found. Updating dependencies instead of installing from lock file. Use composer update over composer install if you do not have a lock file.
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires topthink/framework, it could not be found in any version, there may be a typo in the package name.
  Problem 2
    - Root composer.json requires topthink/think-orm, it could not be found in any version, there may be a typo in the package name.
  Problem 3
    - Root composer.json requires topthink/think-multi-app, it could not be found in any version, there may be a typo in the package name.
  Problem 4
    - Root composer.json requires qiniu/php-sdk, it could not be found in any version, there may be a typo in the package name.
  Problem 5
    - Root composer.json requires aliyuncs/oss-sdk-php, it could not be found in any version, there may be a typo in the package name.
  Problem 6
    - Root composer.json requires qcloud/cos-sdk-v5, it could not be found in any version, there may be a typo in the package name.
  Problem 7
    - Root composer.json requires kosinix/grafika, it could 

解决：
先查看包来源地址，查询命令： composer config -l -g

执行命令： composer config -g repo.packagist composer https://packagist.org

而后composer install完美成功。

也可以尝试使用阿里云的源，并对composer进行升级

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

composer selfupdate