如何查看本机运行的Maven版本号呢？

实现思路：
    在CMD中输入命令 mvn -version 即可输出相应的Maven版本信息

如下例所示

C:\Users\user>mvn -version
Apache Maven 3.8.1 (05c21c65bdfed0f71a2f2ada8b84da59348c4c5d)
Maven home: D:\Maven\apache-maven-3.8.1\bin\..
Java version: 16.0.1, vendor: Oracle Corporation, Runtime: C:\Program Files\Java\jdk-16.0.1
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"