oneventproperty for each event where you can assign a Function to be called when the event fires. You can also use
addEventListener()to hook up multiple listeners to the same event.
listener to the list of callbacks called when the specified event is fired. If
useCapture is true,
listener will be called in the capture phase of the event routing (ie, during the walk down the tree to the target instead of on the way up after firing on the target). Unlike using the
onevent style of listening to events,
addEventListener allows more than one listener to be associated with the event. Use
removeEventListener() to stop listening to the event.