http://www.css88.com/archives/4998 （IE和其他浏览器自定义事件触发器）

js_dispatchEvent.js

document.addEventListener("onmyevent", function(event){
    alert(event.eventType);
}, false);

var obj = document.getElementById("obj");

var event = document.createEvent('HTMLEvents');
event.initEvent("onmyevent", true, true);
event.eventType = 'message';
document.dispatchEvent(event);

===================================================
简单封装下
var events = [];

bindEvent("ddsdjfi", function(e){console.log("dddsjfi");});
bindEvent("xxx", function(e) {
	console.log("xxx");
});
fire("ddsdjfi");
fire("xxx");

function bindEvent(eventName, func) {
	var event = document.createEvent('HTMLEvents');
	event.initEvent(eventName, true, true);
	events.push({name:eventName, event:event});
	document.addEventListener(eventName, func, false);
}

function fire(eventName) {
	for (var i = 0; i <events.length; i++) {
	   if(events[i].name == eventName)
	   	 obj.dispatchEvent(events[i].event);
	};
}