Hijacking event object

In the JS framework, the event object called back by the event system is generally not a real event object. To be compatible with IE, we need to add many W3C attributes for it. Even in a standard browser, many events are also counterfeited. For example, dommousescroll under FF needs to be changed to mousewheel, mouseover in chrome needs to be changed to mouseenter ...... There are too many things to be compatible.

<! Doctype HTML> 
It was tested that any browser that supports addeventlistener can bind these three attributes.
 

 
We can even modify the event type through the event descriptor.
 

 
Object. defineproperty (event, "type", {value: "custom property 4", writable: True, retriable: true });