<html xmlns="http://www.w3c.org/1999/xhtml">
<head>
<title>title</title>
</head>
<script type="text/javascript">
function show()
{
e = document.getElementById('ta');
alert(e.firstChild.nodeValue);
}
</script>
<body>
<textarea id="ta">abcdefg</textarea>
<br/>
<input type="button" value="查看" οnclick="show();">
</body>
</html>