在composer require或者composer install命令中报错了，无法正常下载安装包，报错如下：
代码语言：javascript复制Your requirements could not be resolved to an installable set of packages.
Problem 1
- phpunit/php-code-coverage 4.0.8 requires ext-dom * -> the requested PHP extension dom is missing from your system.
- phpunit/php-code-coverage 4.0.8 requires ext-dom * -> the requested PHP extension dom is missing from your system.
- phpunit/php-code-coverage 4.0.8 requires ext-dom * -> the requested PHP extension dom is missing from your system.
- Installation request for phpunit/php-code-coverage (locked at 4.0.8) -> satisfiable by phpunit/php-code-coverage[4.0.8].
To enable extensions, verify that they are enabled in your .ini files:
解决办法：
代码语言：javascript复制composer require jpush/jpush --ignore-platform-reqs
