JavaScript 事件对象的兼容性方案

HTML:

<div>123</div> 

CSS:

div {     width: 100px;     height: 100px;     background-color: pink; } 

JS:
传统注册方式:

var div = document.querySelector('div'); div.onclick = function(e) {     e = e || window.event;     console.log(e); } 

attachEvent事件监听方式:

div.addEventListener('click', function(e) {     e = e || window.event;     console.log(e); })