仅IE6/7/8中添加同一个事件handler多次触发后会执行多次
如下
<div id="d1" style="width:200px;height:200px;background:gold;"></div>
<script>
function addEvent(el, type, fn){
if(el.addEventListener){
el.addEventListener(type, fn, false
http://cyqdata.cn/cnblogs/article-detail-36112