<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div id="div1">div</div>
</body>
<script>
var oDiv = document.getElementById('div1');
bindEvent(oDiv,'click',function(){
alert(1);
});
bindEvent(oDiv,'click',function(){
alert(2);
});
bindEvent(oDiv,'click',function(){
alert(3);
});
bindEvent(oDiv,'show',function(){
alert(4);
});
bindEvent(oDiv,'show',function(){
alert(5);
});
bindEvent(document,'show',function(){
alert(5);
});
fireEvent(oDiv,'show');
function bindEvent(obj,event,fn){
obj.listeners = obj.listeners || {};
obj.listeners[event] = obj.listeners[event] || [];
obj.listeners[event].push(fn);
obj.addEventListener(event,fn,false);
}
function fireEvent(obj,event){
var fn = obj.listeners[event];
console.log(fn);
for(var i=0;i<fn.length;i++){
obj.listeners[event][i]();
}
}
</script>
</html>
