<script type="text/javascript">
function getWords(){
var text;
if(navigator.appName=="Microsoft Internet Explorer"){
text=document.selection.createRange().text;
}else{
text=window.getSelection();
}
alert(text);
}
</script>
</head>
<body>
<input type="button" value="获取" onclick="getWords()"/>
<br/>
<textarea rows="15" id="txt" cols="100"></textarea>
</body>
</html>