当我下载任何Laravel项目并运行Composer安装时，它都会对我说：
Composer could not find a composer.json file in C:\Users\gbl\My Documents\vertrigoserv\www\
To initialize a project, please create a composer.json file as described in the https://getcomposer.org/ "Getting Started" section
它对我试图运行的任何Laravel项目都不起作用。在所有的项目中都有Composer.json，但是Composer找不到它们。
我用的是Windows 10系统，我也尝试过好几次重新安装Composer，但什么也没有发生。
you might want to try installing composer with-in your project directory. that will create composer.json in your project folder which will enable you to add whichever packages that you wish to add to this composer.json and update it.
also make sure you have added php and composer in your PATH variable
give this a try and let me know if it solved your issue.