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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<ul id="ul">
<li>aa</li>
<li>bb</li>
<li>cc</li>
</ul>
<button id="btn">按我</button>
<script type="text/javascript">
document.getElementById('btn').onclick=function(){
var li = document.createElement('li');
li.appendChild(document.createTextNode('呵呵'));
document.getElementById('ul').appendChild(li);
}
document.getElementById('ul').addEventListener('DOMNodeInserted',
function(){alert('有東西插進來了')},false);
</script>
</body>
</html>
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