添加列表项
<html>
<head>
</head>
<body>
<P>
<input type="text" id="txt"/>
<input type="button" value="添加" id="but"/>
</P>
<ul id="ul">
<li id="li">Java</li>
<li id="li">JavaScript</li>
<li id="li">PHP</li>
</ul>
<script>
var txt = document.getElementById('txt');
var but = document.getElementById('but');
var ul = document.getElementById('ul');
but.onclick = function(){
var li = document.createElement('li');
li.innerHTML = txt.value;
ul.appendChild(li);
txt.value = '';
}
</script>
</body>
</html>
