1.查看java版本
java -version
2.查看nodejs版本
node -v
3.查看npm版本
npm -v
4.查看maven版本
mvn -version或者mvn -v
{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"typ
{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragr