当你composer遇到无法更新的时候

 

The "topthink/think-installer" plugin was skipped because it requires a Plugin API version ("^1.0") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.
Using version ^7.8 for elasticsearch/elasticsearch
./composer.json has been updated
The "topthink/think-installer" plugin was skipped because it requires a Plugin API version ("^1.0") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.
Running composer update elasticsearch/elasticsearch
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - topthink/think-installer is locked to version v2.0.0 and an update of this package was not requested.
    - topthink/think-installer v2.0.0 requires composer-plugin-api ^1.0 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
  Problem 2
    - topthink/think-installer v2.0.0 requires composer-plugin-api ^1.0 -> found composer-plugin-api[2.0.0] but it does not match the constraint.
    - topthink/think-worker v2.0.12 requires topthink/think-installer ^2.0 -> satisfiable by topthink/think-installer[v2.0.0].
    - topthink/think-worker is locked to version v2.0.12 and an update of this package was not requested.

Use the option --with-all-dependencies to allow upgrades, downgrades and removals for packages currently locked to specific versions.

You are using a snapshot build of Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report an issue to them to ask them to support Composer 2. To work around this you can run Composer with --ignore-platform-req=composer-plugin-api, but this may result in broken plugins and bigger problems down the line.
Installation failed, reverting ./composer.json and ./composer.lock to their original content.

当你遇到这个问题的时候，你要考虑你用的composer.phar版本问题

https://getcomposer.org/download/

不要用最新版本，因为上面提示要1.版本所以，2.版本完全不能使用，不然你就会遇到跟我一样的问题,最好解决办法就是将2.降到1.开头，这个文件是放在php文件目录下，这个目录下还有一个文件需要创建composer.cmd 这个文件中需要加入    @php "%~dp0composer.phar" %*   这串文字，还有在Windows是下安装composer 的时候，需要将php.exe文件路径放在环境变量中