打开composer.json文件

把

"repositories": {

        "packagist": {

            "type": "composer",

            "url": "https://packagist.laravel-china.org"

        }

    }

替换为

"repositories": {

        "packagist": {

            "type": "composer",

            "url": "https://mirrors.aliyun.com/composer/"

        }

    }

马上解决