JavaScript事件委托机制与兼容性处理详解

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style>

</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript">
window.onload=function ()
{
  var oUl=document.getElementById('ul1');
  var oBtn=document.getElementById('btn1');
  var iNow=5;
  //事件源的方法依然保留父级事件！
  oUl.onmouseover=function(ev)
  {
    var ev=ev||window.event;
    var target=ev.target||ev.srcElement;
    if(target.nodeName.toLowerCase()=='li')
    {
      target.style.background='red';
    }
  }
  oUl.onmouseout=function(ev)
  {
    var ev=ev||window.event;
    var target=ev.target||ev.srcElement;
    if(target.nodeName.toLowerCase()=='li')
    {
      target.style.background='';
    }
  }
  oBtn.onclick=function()
  {
    iNow++;
    var oLi=document.createElement('li');
    oLi.innerHTML=111*iNow;
    oUl.appendChild(oLi);
  }
}
</script>
</head>
<body >
<input type="button" value="添加" id='btn1'>
<ul id='ul1'>
  <li>11111</li>
  <li>22222</li>
  <li>3333333</li>
  <li>44444444</li>
  <li>66666666</li>
</ul>
</body>
</html>