将composer镜像改为国内

//将Composer更新站点替换为中国全量镜像（很重要，此步没做以后的都不会成功）

composer config -g repo.packagist composerhttps://packagist.phpcomposer.com

还有一些composer常用的命令，你可以了解

还有一些composer常用的命令，你可以了解一下：

//composer更新composer.phard:\www>composer selfupdateYou are already using composer version 1.0.2 (stable channel).//更新缓存d:\www>composer clear-cacheClearing cache (cache-dir): C:\Users\User\AppData\Local\ComposerClearing cache (cache-files-dir): C:\Users\User\AppData\Local\Composer\filesClearing cache (cache-repo-dir): C:\Users\User\AppData\Local\Composer\repoCache directory does not exist (cache-vcs-dir):All caches cleared.d:\www>