<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button id='btn'>跨浏览器事件处理程序</button>
<script>
let eventUtil = {
addHandle:function(el,type,handle){
if(el.addEventListener){
el.addEventListener(type,handle,false)
}else if(el.attachEvent){
el.attachEvent(type,handle,false)
}else{
el['on'+type]=handle
}
},
removeHandle:function(el,type,handle){
if(el.removeEventListener){
el.removeEventListener(type,handle,false)
}else if(el.detachEvent){
el.detachEvent(type,handle,false)
}else{
el['on'+type]=null
}
}
}
// 调用事件工具
function clickBtn(){
console.log('点击事件');
}
let btn = document.getElementById('btn');
eventUtil.addHandle(btn,'click',clickBtn)//打印点击事件
eventUtil.removeHandle(btn,'click',clickBtn)//没有效果
</script>
</body>
</html>