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EventEmitter class extend demo https://jsbin.com/losabat/edit?js,output
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <script src='https://cdnjs.cloudflare.com/ajax/libs/EventEmitter/5.2.6/EventEmitter.min.js'></script> | |
| <script id="jsbin-javascript"> | |
| class Dog extends EventEmitter { | |
| constructor() { | |
| super() | |
| this.barks = 0; | |
| setInterval(() => { | |
| this.trigger("bark", [this.barks ++]); | |
| }, 1000) | |
| } | |
| } | |
| let d = new Dog(); | |
| d.on("bark", barks => { | |
| document.writeln(barks) | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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