howto detect which button is click

hi , good day ..let assume i have ten buttons as follow, how can i know which button was pressed ?

thank you

Add an onclick handler?

eric, i want when user click the button , then we can get the button name which have been clicked

The easiest approach is adding an onclick handler

that stores the value in a variable.

The other approach is the following, I am not sure if it is crossbrowser friendly, have not tried it.

Eric

thanks , eric