javascript自定义事件

一言不合上代码

<input value="aa" type="text" id="mytest" />
<script type="text/javascript">
  var event; // The custom event that will be created
  var element=document.getElementById("mytest");
  if (document.createEvent) {//创建事件
    event = document.createEvent("HTMLEvents");
    event.initEvent("dataavailable", true, true);
    console.log("----->创建事件");//+writeObj(event)
  } else {
  	console.log("bbbbbb--b");
    event = document.createEventObject();
    event.eventType = "dataavailable";
  }
  event.eventName = "dataavailable";
  //绑定事件
  document.addEventListener("dataavailable", function(e) {
    console.log("时间发生的时候："+e.srcElement.value); 
  });
  if (document.createEvent) {//触发事件
  	console.log("---->>>触发事件");//+writeObj(event)
    element.dispatchEvent(event);
  } else {
  	console.log("bbb--bbbbbb");
    element.fireEvent("on" + event.eventType, event);
  }
  
//------------
  function writeObj(obj){ 
	 var description = ""; 
	 for(var i in obj){ 
		  var property=obj[i]; 
		  description+=i+" = "+property+"\n"; 
	 } 
	 //console.log(description); 
	 return description;
  } 
</script>

参考
http://*.com/questions/2490825/how-to-trigger-event-in-javascript