<script src="lib/WMEvent.js"></script>
<script>
var event = new WMEvent();

event.register(["click", "a", "b"]);
event.on(document.body, "click", handler);
event.on(null, "a", handler);
event.on(null, "b", handler);

event.off(document.body, "click", handler);

event.fire(null, "a"

function handler(event) {
}
</script>

importScripts("lib/WMEvent.js");

var event = new WMEvent();
  :
  :

var WMEvent = require("lib/WMEvent.js");

var event = new WMEvent();
  :
  :