composer repositories仓库配置，命令行修改仓库地址

1 全局模式（推荐）：

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

2 单独项目使用

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

扩展：

在项目里的composer.json里面添加

1 数组方式

[ ] 是数组方式，按照顺序查找

{
    "repositories": [
         {
             "type": "composer",
             "url": "https://mirrors.aliyun.com/composer/"
         },
         {
             "type": "composer",
             "url": "https://packagist.org/"
         }
    ]
}

2.对象方式

{ } 对象方式: 使用JSON对象表示法。但是，JSON键/值对应被视为无序，因此无法保证一致的行为

{
    "repositories": {
         "foo": {
             "type": "composer",
             "url": "https://mirrors.aliyun.com/composer/"
         },
         "packagist": {
            "type": "composer",
            "url": "https://packagist.org/"
        }
    }
}