JS: Implementing a Custom Event object interface

NetEase 2017 inside Push pen question

Requirements:

Implement the interface for the following custom events event object, see Comments (Test 1)

The interface of the event object needs to be extended by other objects (test 2)

1     //Test 12Event.on (' Test ',function(Result) {3 Console.log (result);4     });5Event.on (' Test ',function(){6Console.log (' Test ');7     });8Event.emit (' Test ', ' Hello World ');//output ' Hello World ' and ' Test '9     //Test 2Ten     varPerson1 = {}; One     varPerson2 = {}; A object.assign (Person1, Event); - object.assign (Person2, Event); -Person1.on (' Call1 ',function(){ theConsole.log (' Person1 '); -     }); -Person2.on (' Call2 ',function(){ -Console.log (' Person2 '); +     }); -Person1.emit (' call1 ');//output ' Person1 ' +Person2.emit (' call2 ');//No output APerson1.emit (' call1 ');//No output atPerson2.emit (' call2 ');//output ' Person2 ' -  -  -     varEvent = { -         //Monitor event eventname via on interface -         //If event eventname is triggered, the callback callback function is executed inOnfunction(EventName, callback) { -             //Your code to }, +         //Triggering event EventName -Emitfunction(eventName) { the             //Your code *         } $};

• Object.assign(target, ...sources)　　可以把任意多个的源对象自身的可枚举属性拷贝给目标对象，然后返回目标对象。

Here's an article to solve ... But I didn't see http://blog.daraw.cn/2016/08/02/javascript-event-emitter/.

JS: Implementing a Custom Event object interface