javascript 自定义事件 发布-订阅 模式 Event

* javascript自定义事件

var myEvent = document.createEvent("Event");
myEvent.initEvent("myEventName", true, true);

var element = document.createElement("div");
element.addEventListener("myEventName", function(evt) {
  console.log(evt);
  // handle event
});
element.dispatchEvent(myEvent);

　　output:

Event {isTrusted: false, type: "myEventName", target: div, currentTarget: div, eventPhase: 2, …}

@Ref:

// Function synopsis
event.initEvent(eventType,canBubble,cancelable)

Usage:

function trigger(dom, event) {
    var myEvent = document.createEvent('Event')
    myEvent.initEvent(event, true, true);
    dom.dispatchEvent(myEvent);
}
trigger(tab, "mouseover"); 

* 发布-订阅 模式

var salesOffices = {
	clientList: [],
	listen:function(fn) {
		this.clientList.push(fn);
	},
	trigger: function() {
		for (var i = 0, fn; fn = this.clientList[i]; i++) {
			fn.apply(this, arguments);
		}
		return this;
	}
};

// test
salesOffices.listen(function(price, squareMeter) {
	console.log("price="+price);
	console.log("squareMeter=" + squareMeter);
});
salesOffices.trigger(2000000,88).trigger(3000000,110);