简单问题送50分。来者有分了。
这是一段表单提交。
<html>
<head>
<title>
Welcome to Wroxton-on-Sea Tourism Authority
</title>
</head>
<body>
<center>
<table height="100%" width="100%" cellpadding="0" cellspacing="0">
<tr height="50" bgcolor="#cccccc">
<td valign="center" align="center" colspan="3">
<h1><i>Wroxton=onSea Tourism Authority</i></h1>
</td>
</tr>
<tr>
<td width="15%" bgcolor="#cccccc" align="right" valign="top">
<br/>
<br/>
<a href="home.do">Home</a>
<br/>
<a href="registerAttraction.jsp">Register</a>
<br/>
<a href="editAttraction.do">logon</a>
<br/>
</td>
<td valign="top" align="content" />
<br/>
<br/>
<table cellpadding="2">
<form name="attractionForm" method="POST" action="/begjsp-ch13/registerAttraction.do">
<tr>
<td align="right">
<b>User ID:</b>
</td>
<td>
<input type="text" name="userId" size="15" value="">
</td>
<td align="right">
<b>Password:</b>
</td>
<td>
<input type="password" name="password" size="15" value="">
</td>
</tr>
<tr>
<td align="right">
<b>Name:</b>
</td>
<td>
<input type="text" name="name" size="30" value="">
</td>
<td align="right">
<b>Web Site:</b>
</td>
<td>
<input type="text" name="webSite" size="30" value="">
</td>
</tr>
<td align="right" valign="top">
<b>Description:</b>
</td>
<td>
<textarea name="description" cols="20" rows="3"></textarea>
</td>
<td align="right" valign="top">
<b>Address:</b>
</td>
<td>
<textarea name="address" cols="20" rows="3"></textarea>
</td>
</tr>
<tr>
<td>
</td>
<td>
</td>
<td>
</td>
<td>
<input type="submit" name="submit" value="Register attraction">
</td>
</tr>
</form>
<script language="JavaScript" type="text/javascript">
<!--
document.forms["attractionForm"].elements["userId"].focus()
// -->
</script>
</table>
</td>
</tr>
<tr height="10%" bgcolor="#cccccc">
<td valign="center" align="center colspan="3">
</td>
</tr>
</table>
</center>
</body>
</html>
--------------------------------------------------------------------------
其中下面这段javascript代码的意义是什么?
<script language="JavaScript" type="text/javascript">
<!--
document.forms["attractionForm"].elements["userId"].focus()
// -->
</script>