不同语言中类的继承和多态

go
https://blog.csdn.net/rufidmx/article/details/8920731

c和c++（c类似go用struct）
https://blog.csdn.net/wenqiang1208/article/details/76244628

ruby
https://blog.csdn.net/o83290102o5/article/details/79034497

python
http://www.runoob.com/python3/python3-class.html

java
https://blog.csdn.net/qq_16459311/article/details/60740662

php类似java
https://www.cnblogs.com/u1020641/p/5996750.html

js
https://blog.csdn.net/weixin_36065510/article/details/79968285

r（面向过程）
http://blog.fens.me/r-object-oriented-intro/