<!DOCTYPE html>
<html>
<head>
<title>139</title>
<meta charset="utf-8">
<script type="text/javascript">
function ac()
{
var s=document.getElementById("s");
if(confirm("是否全选"))
{
s.select();
}
}
</script>
</head>
<body>
<textarea id="s" onselect="ac()" rows="40" cols="80">dsfhjklfdslkfj</textarea>
</body>
</html>