日期:2014-05-17 浏览次数:20980 次
<!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=gb2312" />
<title>Untitled Document</title>
<script language="javascript">
function checkspace(checkstr) {
var str = '';
for(i = 0; i < checkstr.length; i++) {
str = str + ' ';
}
return (str == checkstr);
}
function checkuser(){
if(checkspace(document.form1.text.value))
{
alert("your name is null");
document.form1.text.focus();
return false;
}
return true
}
</script>
</head>
<body>
<form name="form1" action="#" method="post" onsubmit="return checkuser()">
<table width="200" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>name: <input type="text" size="20" name="text" /></td>
</tr>
<tr>
<td><input type="submit" name="submit" value="提交" /></td>
</tr>
</table>
</form>
</body>
</html>