How do copy without right click on mouse?

Question

How do copy in browser without right click on mouse?
it's my first codе, that I decided to write.
I want to create codе, wich will do copy if you select text with mouse from left to right, and will paste text, if you select from right to left. how I can Implement this and use in google chrome? I just want to see,how it will looks. before this i solved only separate tasks. sorry for my english ))

Answer 1

why using new method if people is used to do the conventional way.
tips. don't reinvent the wheel.

Answer 2

becouse i often missed when choose the options after right click. sometimes i can paste become copy ,it is no good.