js 获取选中文字内容

asdlfjawefo;awejgoawemfaowcmzxvczoasdfwe3wg2222xcvaowdfijq9p23rjq023jrq23r

代码：

<!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>
<title>无标题页</title>
<script type="text/javascript">
function getSelect()
    {
if(window.getSelection)
        {
            alert(window.getSelection());
        }
else
        {
            alert(document.selection.createRange().text);
        }

    }
</script>
</head>
<body>
<div>asdlfjawefo;awejgoawemfaowcmzxvczo<b>asdfwe3wg2222</b>xcvaowdfijq9p23rjq023jrq23r</div>
<input type="button" value="获 取" onclick="getSelect();" />
</body>
</html>

2022-12-23
2021-12-31
2021-12-09
2022-01-02
2022-02-26
2021-09-29
2022-12-23