JavaScript实现文本框自动选中的方法

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>select文件</title>
<script language="javascript" type="text/javascript">
function getFocus()
{
  document.getElementById("test").select();
}
</script>
</head>
<body>
<form id="f1">
<input type="text" id="test" name="test" value="你好嗎？" 
onfocus="getFocus();"/>
</form>
</body>
</html>